Bandwidth Parts Operation in Multiple Active Bandwidth Parts

ABSTRACT

A wireless device receives one or more configuration parameters for uplink bandwidth parts (BWPs) of a cell. A first preamble, for a random-access procedure, is transmitted via a first uplink BWP of the uplink BWPs. A random-access response comprising a backoff indicator is received. A backoff window associated with the backoff indicator is started. A second uplink BWP of the uplink BWPs, that is different from the first uplink BWP, is selected for transmission of a second preamble during the backoff window. The wireless device transmits, via the second uplink BWP and based on the selecting, the second preamble for the random-access procedure.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No.62/737,877, filed Sep. 27, 2018, which is hereby incorporated byreference in its entirety.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

Examples of several of the various embodiments of the present disclosureare described herein with reference to the drawings.

FIG. 1 is a diagram of an example RAN architecture as per an aspect ofan embodiment of the present disclosure.

FIG. 2A is a diagram of an example user plane protocol stack as per anaspect of an embodiment of the present disclosure.

FIG. 2B is a diagram of an example control plane protocol stack as peran aspect of an embodiment of the present disclosure.

FIG. 3 is a diagram of an example wireless device and two base stationsas per an aspect of an embodiment of the present disclosure.

FIG. 4A, FIG. 4B, FIG. 4C and FIG. 4D are example diagrams for uplinkand downlink signal transmission as per an aspect of an embodiment ofthe present disclosure.

FIG. 5A is a diagram of an example uplink channel mapping and exampleuplink physical signals as per an aspect of an embodiment of the presentdisclosure.

FIG. 5B is a diagram of an example downlink channel mapping and exampledownlink physical signals as per an aspect of an embodiment of thepresent disclosure.

FIG. 6 is a diagram depicting an example transmission time or receptiontime for a carrier as per an aspect of an embodiment of the presentdisclosure.

FIG. 7A and FIG. 7B are diagrams depicting example sets of OFDMsubcarriers as per an aspect of an embodiment of the present disclosure.

FIG. 8 is a diagram depicting example OFDM radio resources as per anaspect of an embodiment of the present disclosure.

FIG. 9A is a diagram depicting an example CSI-RS and/or SS blocktransmission in a multi-beam system.

FIG. 9B is a diagram depicting an example downlink beam managementprocedure as per an aspect of an embodiment of the present disclosure.

FIG. 10 is an example diagram of configured BWPs as per an aspect of anembodiment of the present disclosure.

FIG. 11A, and FIG. 11B are diagrams of an example multi connectivity asper an aspect of an embodiment of the present disclosure.

FIG. 12 is a diagram of an example random access procedure as per anaspect of an embodiment of the present disclosure.

FIG. 13 illustrates a structure of example MAC entities as per an aspectof an embodiment of the present disclosure.

FIG. 14 is a diagram of an example RAN architecture as per an aspect ofan embodiment of the present disclosure.

FIG. 15 illustrates example RRC states as per an aspect of an embodimentof the present disclosure.

FIG. 16 illustrates an example random-access configuration as per anaspect of an embodiment of the present disclosure.

FIG. 17 illustrates an example random-access configuration as per anaspect of an embodiment of the present disclosure.

FIG. 18 illustrates an example random-access configuration as per anaspect of an embodiment of the present disclosure.

FIG. 19 illustrates an example random-access configuration as per anaspect of an embodiment of the present disclosure.

FIG. 20 illustrates an example random-access configuration as per anaspect of an embodiment of the present disclosure.

FIG. 21 illustrates an example random-access configuration as per anaspect of an embodiment of the present disclosure.

FIG. 22 is an example of BWP operation as per an aspect of an embodimentof the present disclosure.

FIG. 23 illustrates an example BWP operation as per an aspect of anembodiment of the present disclosure.

FIG. 24A and FIG. 24B illustrates examples of BWP operation as per anaspect of an embodiment of the present disclosure.

FIG. 25 is an example flowchart of BWP operation as per an aspect of anembodiment of the present disclosure.

FIG. 26A and FIG. 26B illustrate examples of BWP operation as per anaspect of an embodiment of the present disclosure.

FIG. 27 is an example of BWP operation as per an aspect of an embodimentof the present disclosure.

FIG. 28 is a flow diagram of an aspect of an example embodiment of thepresent disclosure.

FIG. 29 is a flow diagram of an aspect of an example embodiment of thepresent disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS

Example embodiments of the present disclosure enable operation ofmultiple active bandwidth parts. Embodiments of the technology disclosedherein may be employed in the technical field of multicarriercommunication systems. More particularly, the embodiments of thetechnology disclosed herein may relate to multiple active bandwidthparts in a multicarrier communication system.

The following Acronyms are used throughout the present disclosure:

3GPP 3rd Generation Partnership Project

5GC 5G Core Network

ACK Acknowledgement

AMF Access and Mobility Management Function

ARQ Automatic Repeat Request

AS Access Stratum

ASIC Application-Specific Integrated Circuit

BA Bandwidth Adaptation

BCCH Broadcast Control Channel

BCH Broadcast Channel

BPSK Binary Phase Shift Keying

BWP Bandwidth Part

CA Carrier Aggregation

CC Component Carrier

CCCH Common Control CHannel

CDMA Code Division Multiple Access

CN Core Network

CP Cyclic Prefix

CP-OFDM Cyclic Prefix-Orthogonal Frequency Division Multiplex

C-RNTI Cell-Radio Network Temporary Identifier

CS Configured Scheduling

CSI Channel State Information

CSI-RS Channel State Information-Reference Signal

CQI Channel Quality Indicator

CSS Common Search Space

CU Central Unit

DC Dual Connectivity

DCCH Dedicated Control Channel

DCI Downlink Control Information

DL Downlink

DL-SCH Downlink Shared CHannel

DM-RS DeModulation Reference Signal

DRB Data Radio Bearer

DRX Discontinuous Reception

DTCH Dedicated Traffic Channel

DU Distributed Unit

EPC Evolved Packet Core

E-UTRA Evolved UMTS Terrestrial Radio Access

E-UTRAN Evolved-Universal Terrestrial Radio Access Network

FDD Frequency Division Duplex

FPGA Field Programmable Gate Arrays

F1-C F1-Control plane

F1-U F1-User plane

gNB next generation Node B

HARQ Hybrid Automatic Repeat reQuest

HDL Hardware Description Languages

IE Information Element

IP Internet Protocol

LCID Logical Channel Identifier

LTE Long Term Evolution

MAC Media Access Control

MCG Master Cell Group

MCS Modulation and Coding Scheme

MeNB Master evolved Node B

MIB Master Information Block

MME Mobility Management Entity

MN Master Node

NACK Negative Acknowledgement

NAS Non-Access Stratum

NG CP Next Generation Control Plane

NGC Next Generation Core

NG-C NG-Control plane

ng-eNB next generation evolved Node B

NG-U NG-User plane

NR New Radio

NR MAC New Radio MAC

NR PDCP New Radio PDCP

NR PHY New Radio PHYsical

NR RLC New Radio RLC

NR RRC New Radio RRC

NSSAI Network Slice Selection Assistance Information

O&M Operation and Maintenance

OFDM orthogonal Frequency Division Multiplexing

PBCH Physical Broadcast CHannel

PCC Primary Component Carrier

PCCH Paging Control CHannel

PCell Primary Cell

PCH Paging CHannel

PDCCH Physical Downlink Control CHannel

PDCP Packet Data Convergence Protocol

PDSCH Physical Downlink Shared CHannel

PDU Protocol Data Unit

PHICH Physical HARQ Indicator CHannel

PHY PHYsical

PLMN Public Land Mobile Network

PMI Precoding Matrix Indicator

PRACH Physical Random Access CHannel

PRB Physical Resource Block

PSCell Primary Secondary Cell

PSS Primary Synchronization Signal

pTAG primary Timing Advance Group

PT-RS Phase Tracking Reference Signal

PUCCH Physical Uplink Control CHannel

PUSCH Physical Uplink Shared CHannel

QAM Quadrature Amplitude Modulation

QFI Quality of Service Indicator

QoS Quality of Service

QPSK Quadrature Phase Shift Keying

RA Random Access

RACH Random Access CHannel

RAN Radio Access Network

RAT Radio Access Technology

RA-RNTI Random Access-Radio Network Temporary Identifier

RB Resource Blocks

RBG Resource Block Groups

RI Rank indicator

RLC Radio Link Control

RRC Radio Resource Control

RS Reference Signal

RSRP Reference Signal Received Power

SCC Secondary Component Carrier

SCell Secondary Cell

SCG Secondary Cell Group

SC-FDMA Single Carrier-Frequency Division Multiple Access

SDAP Service Data Adaptation Protocol

SDU Service Data Unit

SeNB Secondary evolved Node B

SFN System Frame Number

S-GW Serving GateWay

SI System Information

SIB System Information Block

SMF Session Management Function

SN Secondary Node

SpCell Special Cell

SRB Signaling Radio Bearer

SRS Sounding Reference Signal

SS Synchronization Signal

SSS Secondary Synchronization Signal

sTAG secondary Timing Advance Group

TA Timing Advance

TAG Timing Advance Group

TAI Tracking Area Identifier

TAT Time Alignment Timer

TB Transport Block

TC-RNTI Temporary Cell-Radio Network Temporary Identifier

TDD Time Division Duplex

TDMA Time Division Multiple Access

TTI Transmission Time Interval

UCI Uplink Control Information

UE User Equipment

UL Uplink

UL-SCH Uplink Shared CHannel

UPF User Plane Function

UPGW User Plane Gateway

VHDL VHSIC Hardware Description Language

Xn-C Xn-Control plane

Xn-U Xn-User plane

Example embodiments of the disclosure may be implemented using variousphysical layer modulation and transmission mechanisms. Exampletransmission mechanisms may include, but are not limited to: CodeDivision Multiple Access (CDMA), Orthogonal Frequency Division MultipleAccess (OFDMA), Time Division Multiple Access (TDMA), Wavelettechnologies, and/or the like. Hybrid transmission mechanisms such asTDMA/CDMA, and OFDM/CDMA may also be employed. Various modulationschemes may be applied for signal transmission in the physical layer.Examples of modulation schemes include, but are not limited to: phase,amplitude, code, a combination of these, and/or the like. An exampleradio transmission method may implement Quadrature Amplitude Modulation(QAM) using Binary Phase Shift Keying (BPSK), Quadrature Phase ShiftKeying (QPSK), 16-QAM, 64-QAM, 256-QAM, 1024-QAM, and/or the like.Physical radio transmission may be enhanced by dynamically orsemi-dynamically changing the modulation and coding scheme depending ontransmission requirements and radio conditions.

FIG. 1 is an example Radio Access Network (RAN) architecture as per anaspect of an embodiment of the present disclosure. As illustrated inthis example, a RAN node may be a next generation Node B (gNB) (e.g.120A, 120B) providing New Radio (NR) user plane and control planeprotocol terminations towards a first wireless device (e.g. 110A). In anexample, a RAN node may be a next generation evolved Node B (ng-eNB)(e.g. 120C, 120D), providing Evolved UMTS Terrestrial Radio Access(E-UTRA) user plane and control plane protocol terminations towards asecond wireless device (e.g. 110B). The first wireless device maycommunicate with a gNB over a Uu interface. The second wireless devicemay communicate with a ng-eNB over a Uu interface.

A gNB or an ng-eNB may host functions such as radio resource managementand scheduling, IP header compression, encryption and integrityprotection of data, selection of Access and Mobility Management Function(AMF) at User Equipment (UE) attachment, routing of user plane andcontrol plane data, connection setup and release, scheduling andtransmission of paging messages (originated from the AMF), schedulingand transmission of system broadcast information (originated from theAMF or Operation and Maintenance (O&M)), measurement and measurementreporting configuration, transport level packet marking in the uplink,session management, support of network slicing, Quality of Service (QoS)flow management and mapping to data radio bearers, support of UEs inRRC_INACTIVE state, distribution function for Non-Access Stratum (NAS)messages, RAN sharing, dual connectivity or tight interworking betweenNR and E-UTRA.

In an example, one or more gNBs and/or one or more ng-eNBs may beinterconnected with each other by means of Xn interface. A gNB or anng-eNB may be connected by means of NG interfaces to 5G Core Network(5GC). In an example, 5GC may comprise one or more AMF/User PlanFunction (UPF) functions (e.g. 130A or 130B). A gNB or an ng-eNB may beconnected to a UPF by means of an NG-User plane (NG-U) interface. TheNG-U interface may provide delivery (e.g. non-guaranteed delivery) ofuser plane Protocol Data Units (PDUs) between a RAN node and the UPF. AgNB or an ng-eNB may be connected to an AMF by means of an NG-Controlplane (NG-C) interface. The NG-C interface may provide functions such asNG interface management, UE context management, UE mobility management,transport of NAS messages, paging, PDU session management, configurationtransfer or warning message transmission.

In an example, a UPF may host functions such as anchor point forintra-/inter-Radio Access Technology (RAT) mobility (when applicable),external PDU session point of interconnect to data network, packetrouting and forwarding, packet inspection and user plane part of policyrule enforcement, traffic usage reporting, uplink classifier to supportrouting traffic flows to a data network, branching point to supportmulti-homed PDU session, QoS handling for user plane, e.g. packetfiltering, gating, Uplink (UL)/Downlink (DL) rate enforcement, uplinktraffic verification (e.g. Service Data Flow (SDF) to QoS flow mapping),downlink packet buffering and/or downlink data notification triggering.

In an example, an AMF may host functions such as NAS signalingtermination, NAS signaling security, Access Stratum (AS) securitycontrol, inter Core Network (CN) node signaling for mobility between3^(rd) Generation Partnership Project (3GPP) access networks, idle modeUE reachability (e.g., control and execution of paging retransmission),registration area management, support of intra-system and inter-systemmobility, access authentication, access authorization including check ofroaming rights, mobility management control (subscription and policies),support of network slicing and/or Session Management Function (SMF)selection.

FIG. 2A is an example user plane protocol stack, where Service DataAdaptation Protocol (SDAP) (e.g. 211 and 221), Packet Data ConvergenceProtocol (PDCP) (e.g. 212 and 222), Radio Link Control (RLC) (e.g. 213and 223) and Media Access Control (MAC) (e.g. 214 and 224) sublayers andPhysical (PHY) (e.g. 215 and 225) layer may be terminated in wirelessdevice (e.g. 110) and gNB (e.g. 120) on the network side. In an example,a PHY layer provides transport services to higher layers (e.g. MAC, RRC,etc.). In an example, services and functions of a MAC sublayer maycomprise mapping between logical channels and transport channels,multiplexing/demultiplexing of MAC Service Data Units (SDUs) belongingto one or different logical channels into/from Transport Blocks (TB s)delivered to/from the PHY layer, scheduling information reporting, errorcorrection through Hybrid Automatic Repeat request (HARQ) (e.g. one HARQentity per carrier in case of Carrier Aggregation (CA)), priorityhandling between UEs by means of dynamic scheduling, priority handlingbetween logical channels of one UE by means of logical channelprioritization, and/or padding. A MAC entity may support one or multiplenumerologies and/or transmission timings. In an example, mappingrestrictions in a logical channel prioritization may control whichnumerology and/or transmission timing a logical channel may use. In anexample, an RLC sublayer may supports transparent mode (TM),unacknowledged mode (UM) and acknowledged mode (AM) transmission modes.The RLC configuration may be per logical channel with no dependency onnumerologies and/or Transmission Time Interval (TTI) durations. In anexample, Automatic Repeat Request (ARQ) may operate on any of thenumerologies and/or TTI durations the logical channel is configuredwith. In an example, services and functions of the PDCP layer for theuser plane may comprise sequence numbering, header compression anddecompression, transfer of user data, reordering and duplicatedetection, PDCP PDU routing (e.g. in case of split bearers),retransmission of PDCP SDUs, ciphering, deciphering and integrityprotection, PDCP SDU discard, PDCP reestablishment and data recovery forRLC AM, and/or duplication of PDCP PDUs. In an example, services andfunctions of SDAP may comprise mapping between a QoS flow and a dataradio bearer. In an example, services and functions of SDAP may comprisemapping Quality of Service Indicator (QFI) in DL and UL packets. In anexample, a protocol entity of SDAP may be configured for an individualPDU session.

FIG. 2B is an example control plane protocol stack where PDCP (e.g. 233and 242), RLC (e.g. 234 and 243) and MAC (e.g. 235 and 244) sublayersand PHY (e.g. 236 and 245) layer may be terminated in wireless device(e.g. 110) and gNB (e.g. 120) on a network side and perform service andfunctions described above. In an example, RRC (e.g. 232 and 241) may beterminated in a wireless device and a gNB on a network side. In anexample, services and functions of RRC may comprise broadcast of systeminformation related to AS and NAS, paging initiated by 5GC or RAN,establishment, maintenance and release of an RRC connection between theUE and RAN, security functions including key management, establishment,configuration, maintenance and release of Signaling Radio Bearers (SRBs)and Data Radio Bearers (DRBs), mobility functions, QoS managementfunctions, UE measurement reporting and control of the reporting,detection of and recovery from radio link failure, and/or NAS messagetransfer to/from NAS from/to a UE. In an example, NAS control protocol(e.g. 231 and 251) may be terminated in the wireless device and AMF(e.g. 130) on a network side and may perform functions such asauthentication, mobility management between a UE and a AMF for 3GPPaccess and non-3GPP access, and session management between a UE and aSMF for 3GPP access and non-3GPP access.

In an example, a base station may configure a plurality of logicalchannels for a wireless device. A logical channel in the plurality oflogical channels may correspond to a radio bearer and the radio bearermay be associated with a QoS requirement. In an example, a base stationmay configure a logical channel to be mapped to one or moreTTIs/numerologies in a plurality of TTIs/numerologies. The wirelessdevice may receive a Downlink Control Information (DCI) via PhysicalDownlink Control CHannel (PDCCH) indicating an uplink grant. In anexample, the uplink grant may be for a first TTI/numerology and mayindicate uplink resources for transmission of a transport block. Thebase station may configure each logical channel in the plurality oflogical channels with one or more parameters to be used by a logicalchannel prioritization procedure at the MAC layer of the wirelessdevice. The one or more parameters may comprise priority, prioritizedbit rate, etc. A logical channel in the plurality of logical channelsmay correspond to one or more buffers comprising data associated withthe logical channel. The logical channel prioritization procedure mayallocate the uplink resources to one or more first logical channels inthe plurality of logical channels and/or one or more MAC ControlElements (CEs). The one or more first logical channels may be mapped tothe first TTI/numerology. The MAC layer at the wireless device maymultiplex one or more MAC CEs and/or one or more MAC SDUs (e.g., logicalchannel) in a MAC PDU (e.g., transport block). In an example, the MACPDU may comprise a MAC header comprising a plurality of MAC sub-headers.A MAC sub-header in the plurality of MAC sub-headers may correspond to aMAC CE or a MAC SUD (logical channel) in the one or more MAC CEs and/orone or more MAC SDUs. In an example, a MAC CE or a logical channel maybe configured with a Logical Channel IDentifier (LCID). In an example,LCID for a logical channel or a MAC CE may be fixed/pre-configured. Inan example, LCID for a logical channel or MAC CE may be configured forthe wireless device by the base station. The MAC sub-headercorresponding to a MAC CE or a MAC SDU may comprise LCID associated withthe MAC CE or the MAC SDU.

In an example, a base station may activate and/or deactivate and/orimpact one or more processes (e.g., set values of one or more parametersof the one or more processes or start and/or stop one or more timers ofthe one or more processes) at the wireless device by employing one ormore MAC commands. The one or more MAC commands may comprise one or moreMAC control elements. In an example, the one or more processes maycomprise activation and/or deactivation of PDCP packet duplication forone or more radio bearers. The base station may transmit a MAC CEcomprising one or more fields, the values of the fields indicatingactivation and/or deactivation of PDCP duplication for the one or moreradio bearers. In an example, the one or more processes may compriseChannel State Information (CSI) transmission of on one or more cells.The base station may transmit one or more MAC CEs indicating activationand/or deactivation of the CSI transmission on the one or more cells. Inan example, the one or more processes may comprise activation ordeactivation of one or more secondary cells. In an example, the basestation may transmit a MA CE indicating activation or deactivation ofone or more secondary cells. In an example, the base station maytransmit one or more MAC CEs indicating starting and/or stopping one ormore Discontinuous Reception (DRX) timers at the wireless device. In anexample, the base station may transmit one or more MAC CEs indicatingone or more timing advance values for one or more Timing Advance Groups(TAGs).

FIG. 3 is a block diagram of base stations (base station 1, 120A, andbase station 2, 120B) and a wireless device 110. A wireless device maybe called an UE. A base station may be called a NB, eNB, gNB, and/orng-eNB. In an example, a wireless device and/or a base station may actas a relay node. The base station 1, 120A, may comprise at least onecommunication interface 320A (e.g. a wireless modem, an antenna, a wiredmodem, and/or the like), at least one processor 321A, and at least oneset of program code instructions 323A stored in non-transitory memory322A and executable by the at least one processor 321A. The base station2, 120B, may comprise at least one communication interface 320B, atleast one processor 321B, and at least one set of program codeinstructions 323B stored in non-transitory memory 322B and executable bythe at least one processor 321B.

A base station may comprise many sectors for example: 1, 2, 3, 4, or 6sectors. A base station may comprise many cells, for example, rangingfrom 1 to 50 cells or more. A cell may be categorized, for example, as aprimary cell or secondary cell. At Radio Resource Control (RRC)connection establishment/re-establishment/handover, one serving cell mayprovide the NAS (non-access stratum) mobility information (e.g. TrackingArea Identifier (TAI)). At RRC connection re-establishment/handover, oneserving cell may provide the security input. This cell may be referredto as the Primary Cell (PCell). In the downlink, a carrier correspondingto the PCell may be a DL Primary Component Carrier (PCC), while in theuplink, a carrier may be an UL PCC. Depending on wireless devicecapabilities, Secondary Cells (SCells) may be configured to formtogether with a PCell a set of serving cells. In a downlink, a carriercorresponding to an SCell may be a downlink secondary component carrier(DL SCC), while in an uplink, a carrier may be an uplink secondarycomponent carrier (UL SCC). An SCell may or may not have an uplinkcarrier.

A cell, comprising a downlink carrier and optionally an uplink carrier,may be assigned a physical cell ID and a cell index. A carrier (downlinkor uplink) may belong to one cell. The cell ID or cell index may alsoidentify the downlink carrier or uplink carrier of the cell (dependingon the context it is used). In the disclosure, a cell ID may be equallyreferred to a carrier ID, and a cell index may be referred to a carrierindex. In an implementation, a physical cell ID or a cell index may beassigned to a cell. A cell ID may be determined using a synchronizationsignal transmitted on a downlink carrier. A cell index may be determinedusing RRC messages. For example, when the disclosure refers to a firstphysical cell ID for a first downlink carrier, the disclosure may meanthe first physical cell ID is for a cell comprising the first downlinkcarrier. The same concept may apply to, for example, carrier activation.When the disclosure indicates that a first carrier is activated, thespecification may equally mean that a cell comprising the first carrieris activated.

A base station may transmit to a wireless device one or more messages(e.g. RRC messages) comprising a plurality of configuration parametersfor one or more cells. One or more cells may comprise at least oneprimary cell and at least one secondary cell. In an example, an RRCmessage may be broadcasted or unicasted to the wireless device. In anexample, configuration parameters may comprise common parameters anddedicated parameters.

Services and/or functions of an RRC sublayer may comprise at least oneof: broadcast of system information related to AS and NAS; paginginitiated by 5GC and/or NG-RAN; establishment, maintenance, and/orrelease of an RRC connection between a wireless device and NG-RAN, whichmay comprise at least one of addition, modification and release ofcarrier aggregation; or addition, modification, and/or release of dualconnectivity in NR or between E-UTRA and NR. Services and/or functionsof an RRC sublayer may further comprise at least one of securityfunctions comprising key management; establishment, configuration,maintenance, and/or release of Signaling Radio Bearers (SRBs) and/orData Radio Bearers (DRBs); mobility functions which may comprise atleast one of a handover (e.g. intra NR mobility or inter-RAT mobility)and a context transfer; or a wireless device cell selection andreselection and control of cell selection and reselection. Servicesand/or functions of an RRC sublayer may further comprise at least one ofQoS management functions; a wireless device measurementconfiguration/reporting; detection of and/or recovery from radio linkfailure; or NAS message transfer to/from a core network entity (e.g.AMF, Mobility Management Entity (MME)) from/to the wireless device.

An RRC sublayer may support an RRC_Idle state, an RRC_Inactive stateand/or an RRC_Connected state for a wireless device. In an RRC_Idlestate, a wireless device may perform at least one of: Public Land MobileNetwork (PLMN) selection; receiving broadcasted system information; cellselection/re-selection; monitoring/receiving a paging for mobileterminated data initiated by 5GC; paging for mobile terminated data areamanaged by 5GC; or DRX for CN paging configured via NAS. In anRRC_Inactive state, a wireless device may perform at least one of:receiving broadcasted system information; cell selection/re-selection;monitoring/receiving a RAN/CN paging initiated by NG-RAN/5GC; RAN-basednotification area (RNA) managed by NG-RAN; or DRX for RAN/CN pagingconfigured by NG-RAN/NAS. In an RRC_Idle state of a wireless device, abase station (e.g. NG-RAN) may keep a 5GC-NG-RAN connection (bothC/U-planes) for the wireless device; and/or store a UE AS context forthe wireless device. In an RRC_Connected state of a wireless device, abase station (e.g. NG-RAN) may perform at least one of: establishment of5GC-NG-RAN connection (both C/U-planes) for the wireless device; storinga UE AS context for the wireless device; transmit/receive of unicastdata to/from the wireless device; or network-controlled mobility basedon measurement results received from the wireless device. In anRRC_Connected state of a wireless device, an NG-RAN may know a cell thatthe wireless device belongs to.

System information (SI) may be divided into minimum SI and other SI. Theminimum SI may be periodically broadcast. The minimum SI may comprisebasic information required for initial access and information foracquiring any other SI broadcast periodically or provisioned on-demand,i.e. scheduling information. The other SI may either be broadcast, or beprovisioned in a dedicated manner, either triggered by a network or uponrequest from a wireless device. A minimum SI may be transmitted via twodifferent downlink channels using different messages (e.g.MasterInformationBlock and SystemInformationBlockType1). An other SI maybe transmitted via SystemInformationBlockType2. For a wireless device inan RRC_Connected state, dedicated RRC signaling may be employed for therequest and delivery of the other SI. For the wireless device in theRRC_Idle state and/or the RRC_Inactive state, the request may trigger arandom-access procedure.

A wireless device may report its radio access capability informationwhich may be static. A base station may request what capabilities for awireless device to report based on band information. When allowed by anetwork, a temporary capability restriction request may be sent by thewireless device to signal the limited availability of some capabilities(e.g. due to hardware sharing, interference or overheating) to the basestation. The base station may confirm or reject the request. Thetemporary capability restriction may be transparent to 5GC (e.g., staticcapabilities may be stored in 5GC).

When CA is configured, a wireless device may have an RRC connection witha network. At RRC connection establishment/re-establishment/handoverprocedure, one serving cell may provide NAS mobility information, and atRRC connection re-establishment/handover, one serving cell may provide asecurity input. This cell may be referred to as the PCell. Depending onthe capabilities of the wireless device, SCells may be configured toform together with the PCell a set of serving cells. The configured setof serving cells for the wireless device may comprise one PCell and oneor more SCells.

The reconfiguration, addition and removal of SCells may be performed byRRC. At intra-NR handover, RRC may also add, remove, or reconfigureSCells for usage with the target PCell. When adding a new SCell,dedicated RRC signaling may be employed to send all required systeminformation of the SCell i.e. while in connected mode, wireless devicesmay not need to acquire broadcasted system information directly from theSCells.

The purpose of an RRC connection reconfiguration procedure may be tomodify an RRC connection, (e.g. to establish, modify and/or release RBs,to perform handover, to setup, modify, and/or release measurements, toadd, modify, and/or release SCells and cell groups). As part of the RRCconnection reconfiguration procedure, NAS dedicated information may betransferred from the network to the wireless device. TheRRCConnectionReconfiguration message may be a command to modify an RRCconnection. It may convey information for measurement configuration,mobility control, radio resource configuration (e.g. RBs, MAC mainconfiguration and physical channel configuration) comprising anyassociated dedicated NAS information and security configuration. If thereceived RRC Connection Reconfiguration message includes thesCellToReleaseList, the wireless device may perform an SCell release. Ifthe received RRC Connection Reconfiguration message includes thesCellToAddModList, the wireless device may perform SCell additions ormodification.

An RRC connection establishment (or reestablishment, resume) proceduremay be to establish (or reestablish, resume) an RRC connection. an RRCconnection establishment procedure may comprise SRB1 establishment. TheRRC connection establishment procedure may be used to transfer theinitial NAS dedicated information/message from a wireless device toE-UTRAN. The RRCConnectionReestablishment message may be used tore-establish SRB1.

A measurement report procedure may be to transfer measurement resultsfrom a wireless device to NG-RAN. The wireless device may initiate ameasurement report procedure after successful security activation. Ameasurement report message may be employed to transmit measurementresults.

The wireless device 110 may comprise at least one communicationinterface 310 (e.g. a wireless modem, an antenna, and/or the like), atleast one processor 314, and at least one set of program codeinstructions 316 stored in non-transitory memory 315 and executable bythe at least one processor 314. The wireless device 110 may furthercomprise at least one of at least one speaker/microphone 311, at leastone keypad 312, at least one display/touchpad 313, at least one powersource 317, at least one global positioning system (GPS) chipset 318,and other peripherals 319.

The processor 314 of the wireless device 110, the processor 321A of thebase station 1 120A, and/or the processor 321B of the base station 2120B may comprise at least one of a general-purpose processor, a digitalsignal processor (DSP), a controller, a microcontroller, an applicationspecific integrated circuit (ASIC), a field programmable gate array(FPGA) and/or other programmable logic device, discrete gate and/ortransistor logic, discrete hardware components, and the like. Theprocessor 314 of the wireless device 110, the processor 321A in basestation 1 120A, and/or the processor 321B in base station 2 120B mayperform at least one of signal coding/processing, data processing, powercontrol, input/output processing, and/or any other functionality thatmay enable the wireless device 110, the base station 1 120A and/or thebase station 2 120B to operate in a wireless environment.

The processor 314 of the wireless device 110 may be connected to thespeaker/microphone 311, the keypad 312, and/or the display/touchpad 313.The processor 314 may receive user input data from and/or provide useroutput data to the speaker/microphone 311, the keypad 312, and/or thedisplay/touchpad 313. The processor 314 in the wireless device 110 mayreceive power from the power source 317 and/or may be configured todistribute the power to the other components in the wireless device 110.The power source 317 may comprise at least one of one or more dry cellbatteries, solar cells, fuel cells, and the like. The processor 314 maybe connected to the GPS chipset 318. The GPS chipset 318 may beconfigured to provide geographic location information of the wirelessdevice 110.

The processor 314 of the wireless device 110 may further be connected toother peripherals 319, which may comprise one or more software and/orhardware modules that provide additional features and/orfunctionalities. For example, the peripherals 319 may comprise at leastone of an accelerometer, a satellite transceiver, a digital camera, auniversal serial bus (USB) port, a hands-free headset, a frequencymodulated (FM) radio unit, a media player, an Internet browser, and thelike.

The communication interface 320A of the base station 1, 120A, and/or thecommunication interface 320B of the base station 2, 120B, may beconfigured to communicate with the communication interface 310 of thewireless device 110 via a wireless link 330A and/or a wireless link 330Brespectively. In an example, the communication interface 320A of thebase station 1, 120A, may communicate with the communication interface320B of the base station 2 and other RAN and core network nodes.

The wireless link 330A and/or the wireless link 330B may comprise atleast one of a bi-directional link and/or a directional link. Thecommunication interface 310 of the wireless device 110 may be configuredto communicate with the communication interface 320A of the base station1 120A and/or with the communication interface 320B of the base station2 120B. The base station 1 120A and the wireless device 110 and/or thebase station 2 120B and the wireless device 110 may be configured tosend and receive transport blocks via the wireless link 330A and/or viathe wireless link 330B, respectively. The wireless link 330A and/or thewireless link 330B may employ at least one frequency carrier. Accordingto some of various aspects of embodiments, transceiver(s) may beemployed. A transceiver may be a device that comprises both atransmitter and a receiver. Transceivers may be employed in devices suchas wireless devices, base stations, relay nodes, and/or the like.Example embodiments for radio technology implemented in thecommunication interface 310, 320A, 320B and the wireless link 330A, 330Bare illustrated in FIG. 4A, FIG. 4B, FIG. 4C, FIG. 4D, FIG. 6, FIG. 7A,FIG. 7B, FIG. 8, and associated text.

In an example, other nodes in a wireless network (e.g. AMF, UPF, SMF,etc.) may comprise one or more communication interfaces, one or moreprocessors, and memory storing instructions.

A node (e.g. wireless device, base station, AMF, SMF, UPF, servers,switches, antennas, and/or the like) may comprise one or moreprocessors, and memory storing instructions that when executed by theone or more processors causes the node to perform certain processesand/or functions. Example embodiments may enable operation ofsingle-carrier and/or multi-carrier communications. Other exampleembodiments may comprise a non-transitory tangible computer readablemedia comprising instructions executable by one or more processors tocause operation of single-carrier and/or multi-carrier communications.Yet other example embodiments may comprise an article of manufacturethat comprises a non-transitory tangible computer readablemachine-accessible medium having instructions encoded thereon forenabling programmable hardware to cause a node to enable operation ofsingle-carrier and/or multi-carrier communications. The node may includeprocessors, memory, interfaces, and/or the like.

An interface may comprise at least one of a hardware interface, afirmware interface, a software interface, and/or a combination thereof.The hardware interface may comprise connectors, wires, electronicdevices such as drivers, amplifiers, and/or the like. The softwareinterface may comprise code stored in a memory device to implementprotocol(s), protocol layers, communication drivers, device drivers,combinations thereof, and/or the like. The firmware interface maycomprise a combination of embedded hardware and code stored in and/or incommunication with a memory device to implement connections, electronicdevice operations, protocol(s), protocol layers, communication drivers,device drivers, hardware operations, combinations thereof, and/or thelike.

FIG. 4A, FIG. 4B, FIG. 4C and FIG. 4D are example diagrams for uplinkand downlink signal transmission as per an aspect of an embodiment ofthe present disclosure. FIG. 4A shows an example uplink transmitter forat least one physical channel. A baseband signal representing a physicaluplink shared channel may perform one or more functions. The one or morefunctions may comprise at least one of: scrambling; modulation ofscrambled bits to generate complex-valued symbols; mapping of thecomplex-valued modulation symbols onto one or several transmissionlayers; transform precoding to generate complex-valued symbols;precoding of the complex-valued symbols; mapping of precodedcomplex-valued symbols to resource elements; generation ofcomplex-valued time-domain Single Carrier-Frequency Division MultipleAccess (SC-FDMA) or CP-OFDM signal for an antenna port; and/or the like.In an example, when transform precoding is enabled, a SC-FDMA signal foruplink transmission may be generated. In an example, when transformprecoding is not enabled, an CP-OFDM signal for uplink transmission maybe generated by FIG. 4A. These functions are illustrated as examples andit is anticipated that other mechanisms may be implemented in variousembodiments.

An example structure for modulation and up-conversion to the carrierfrequency of the complex-valued SC-FDMA or CP-OFDM baseband signal foran antenna port and/or the complex-valued Physical Random Access CHannel(PRACH) baseband signal is shown in FIG. 4B. Filtering may be employedprior to transmission.

An example structure for downlink transmissions is shown in FIG. 4C. Thebaseband signal representing a downlink physical channel may perform oneor more functions. The one or more functions may comprise: scrambling ofcoded bits in a codeword to be transmitted on a physical channel;modulation of scrambled bits to generate complex-valued modulationsymbols; mapping of the complex-valued modulation symbols onto one orseveral transmission layers; precoding of the complex-valued modulationsymbols on a layer for transmission on the antenna ports; mapping ofcomplex-valued modulation symbols for an antenna port to resourceelements; generation of complex-valued time-domain OFDM signal for anantenna port; and/or the like. These functions are illustrated asexamples and it is anticipated that other mechanisms may be implementedin various embodiments.

In an example, a gNB may transmit a first symbol and a second symbol onan antenna port, to a wireless device. The wireless device may infer thechannel (e.g., fading gain, multipath delay, etc.) for conveying thesecond symbol on the antenna port, from the channel for conveying thefirst symbol on the antenna port. In an example, a first antenna portand a second antenna port may be quasi co-located if one or morelarge-scale properties of the channel over which a first symbol on thefirst antenna port is conveyed may be inferred from the channel overwhich a second symbol on a second antenna port is conveyed. The one ormore large-scale properties may comprise at least one of: delay spread;doppler spread; doppler shift; average gain; average delay; and/orspatial Receiving (Rx) parameters.

An example modulation and up-conversion to the carrier frequency of thecomplex-valued OFDM baseband signal for an antenna port is shown in FIG.4D. Filtering may be employed prior to transmission.

FIG. 5A is a diagram of an example uplink channel mapping and exampleuplink physical signals. FIG. 5B is a diagram of an example downlinkchannel mapping and a downlink physical signals. In an example, aphysical layer may provide one or more information transfer services toa MAC and/or one or more higher layers. For example, the physical layermay provide the one or more information transfer services to the MAC viaone or more transport channels. An information transfer service mayindicate how and with what characteristics data are transferred over theradio interface.

In an example embodiment, a radio network may comprise one or moredownlink and/or uplink transport channels. For example, a diagram inFIG. 5A shows example uplink transport channels comprising Uplink-SharedCHannel (UL-SCH) 501 and Random Access CHannel (RACH) 502. A diagram inFIG. 5B shows example downlink transport channels comprisingDownlink-Shared CHannel (DL-SCH) 511, Paging CHannel (PCH) 512, andBroadcast CHannel (BCH) 513. A transport channel may be mapped to one ormore corresponding physical channels. For example, UL-SCH 501 may bemapped to Physical Uplink Shared CHannel (PUSCH) 503. RACH 502 may bemapped to PRACH 505. DL-SCH 511 and PCH 512 may be mapped to PhysicalDownlink Shared CHannel (PDSCH) 514. BCH 513 may be mapped to PhysicalBroadcast CHannel (PBCH) 516.

There may be one or more physical channels without a correspondingtransport channel. The one or more physical channels may be employed forUplink Control Information (UCI) 509 and/or Downlink Control Information(DCI) 517. For example, Physical Uplink Control CHannel (PUCCH) 504 maycarry UCI 509 from a UE to a base station. For example, PhysicalDownlink Control CHannel (PDCCH) 515 may carry DCI 517 from a basestation to a UE. NR may support UCI 509 multiplexing in PUSCH 503 whenUCI 509 and PUSCH 503 transmissions may coincide in a slot at least inpart. The UCI 509 may comprise at least one of CSI, Acknowledgement(ACK)/Negative Acknowledgement (NACK), and/or scheduling request. TheDCI 517 on PDCCH 515 may indicate at least one of following: one or moredownlink assignments and/or one or more uplink scheduling grants

In uplink, a UE may transmit one or more Reference Signals (RSs) to abase station. For example, the one or more RSs may be at least one ofDemodulation-RS (DM-RS) 506, Phase Tracking-RS (PT-RS) 507, and/orSounding RS (SRS) 508. In downlink, a base station may transmit (e.g.,unicast, multicast, and/or broadcast) one or more RSs to a UE. Forexample, the one or more RSs may be at least one of PrimarySynchronization Signal (PSS)/Secondary Synchronization Signal (SSS) 521,CSI-RS 522, DM-RS 523, and/or PT-RS 524.

In an example, a UE may transmit one or more uplink DM-RSs 506 to a basestation for channel estimation, for example, for coherent demodulationof one or more uplink physical channels (e.g., PUSCH 503 and/or PUCCH504). For example, a UE may transmit a base station at least one uplinkDM-RS 506 with PUSCH 503 and/or PUCCH 504, wherein the at least oneuplink DM-RS 506 may be spanning a same frequency range as acorresponding physical channel. In an example, a base station mayconfigure a UE with one or more uplink DM-RS configurations. At leastone DM-RS configuration may support a front-loaded DM-RS pattern. Afront-loaded DM-RS may be mapped over one or more OFDM symbols (e.g., 1or 2 adjacent OFDM symbols). One or more additional uplink DM-RS may beconfigured to transmit at one or more symbols of a PUSCH and/or PUCCH. Abase station may semi-statistically configure a UE with a maximum numberof front-loaded DM-RS symbols for PUSCH and/or PUCCH. For example, a UEmay schedule a single-symbol DM-RS and/or double symbol DM-RS based on amaximum number of front-loaded DM-RS symbols, wherein a base station mayconfigure the UE with one or more additional uplink DM-RS for PUSCHand/or PUCCH. A new radio network may support, e.g., at least forCP-OFDM, a common DM-RS structure for DL and UL, wherein a DM-RSlocation, DM-RS pattern, and/or scrambling sequence may be same ordifferent.

In an example, whether uplink PT-RS 507 is present or not may depend ona RRC configuration. For example, a presence of uplink PT-RS may beUE-specifically configured. For example, a presence and/or a pattern ofuplink PT-RS 507 in a scheduled resource may be UE-specificallyconfigured by a combination of RRC signaling and/or association with oneor more parameters employed for other purposes (e.g., Modulation andCoding Scheme (MCS)) which may be indicated by DCI. When configured, adynamic presence of uplink PT-RS 507 may be associated with one or moreDCI parameters comprising at least MCS. A radio network may supportplurality of uplink PT-RS densities defined in time/frequency domain.When present, a frequency domain density may be associated with at leastone configuration of a scheduled bandwidth. A UE may assume a sameprecoding for a DMRS port and a PT-RS port. A number of PT-RS ports maybe fewer than a number of DM-RS ports in a scheduled resource. Forexample, uplink PT-RS 507 may be confined in the scheduledtime/frequency duration for a UE.

In an example, a UE may transmit SRS 508 to a base station for channelstate estimation to support uplink channel dependent scheduling and/orlink adaptation. For example, SRS 508 transmitted by a UE may allow fora base station to estimate an uplink channel state at one or moredifferent frequencies. A base station scheduler may employ an uplinkchannel state to assign one or more resource blocks of good quality foran uplink PUSCH transmission from a UE. A base station maysemi-statistically configure a UE with one or more SRS resource sets.For an SRS resource set, a base station may configure a UE with one ormore SRS resources. An SRS resource set applicability may be configuredby a higher layer (e.g., RRC) parameter. For example, when a higherlayer parameter indicates beam management, a SRS resource in each of oneor more SRS resource sets may be transmitted at a time instant. A UE maytransmit one or more SRS resources in different SRS resource setssimultaneously. A new radio network may support aperiodic, periodicand/or semi-persistent SRS transmissions. A UE may transmit SRSresources based on one or more trigger types, wherein the one or moretrigger types may comprise higher layer signaling (e.g., RRC) and/or oneor more DCI formats (e.g., at least one DCI format may be employed for aUE to select at least one of one or more configured SRS resource sets.An SRS trigger type 0 may refer to an SRS triggered based on a higherlayer signaling. An SRS trigger type 1 may refer to an SRS triggeredbased on one or more DCI formats. In an example, when PUSCH 503 and SRS508 are transmitted in a same slot, a UE may be configured to transmitSRS 508 after a transmission of PUSCH 503 and corresponding uplink DM-RS506.

In an example, a base station may semi-statistically configure a UE withone or more SRS configuration parameters indicating at least one offollowing: a SRS resource configuration identifier, a number of SRSports, time domain behavior of SRS resource configuration (e.g., anindication of periodic, semi-persistent, or aperiodic SRS), slot(mini-slot, and/or subframe) level periodicity and/or offset for aperiodic and/or aperiodic SRS resource, a number of OFDM symbols in aSRS resource, starting OFDM symbol of a SRS resource, a SRS bandwidth, afrequency hopping bandwidth, a cyclic shift, and/or a SRS sequence ID.

In an example, in a time domain, an SS/PBCH block may comprise one ormore OFDM symbols (e.g., 4 OFDM symbols numbered in increasing orderfrom 0 to 3) within the SS/PBCH block. An SS/PBCH block may comprisePSS/SSS 521 and PBCH 516. In an example, in the frequency domain, anSS/PBCH block may comprise one or more contiguous subcarriers (e.g., 240contiguous subcarriers with the subcarriers numbered in increasing orderfrom 0 to 239) within the SS/PBCH block. For example, a PSS/SSS 521 mayoccupy 1 OFDM symbol and 127 subcarriers. For example, PBCH 516 may spanacross 3 OFDM symbols and 240 subcarriers. A UE may assume that one ormore SS/PBCH blocks transmitted with a same block index may be quasico-located, e.g., with respect to Doppler spread, Doppler shift, averagegain, average delay, and spatial Rx parameters. A UE may not assumequasi co-location for other SS/PBCH block transmissions. A periodicityof an SS/PBCH block may be configured by a radio network (e.g., by anRRC signaling) and one or more time locations where the SS/PBCH blockmay be sent may be determined by sub-carrier spacing. In an example, aUE may assume a band-specific sub-carrier spacing for an SS/PBCH blockunless a radio network has configured a UE to assume a differentsub-carrier spacing.

In an example, downlink CSI-RS 522 may be employed for a UE to acquirechannel state information. A radio network may support periodic,aperiodic, and/or semi-persistent transmission of downlink CSI-RS 522.For example, a base station may semi-statistically configure and/orreconfigure a UE with periodic transmission of downlink CSI-RS 522. Aconfigured CSI-RS resources may be activated ad/or deactivated. Forsemi-persistent transmission, an activation and/or deactivation ofCSI-RS resource may be triggered dynamically. In an example, CSI-RSconfiguration may comprise one or more parameters indicating at least anumber of antenna ports. For example, a base station may configure a UEwith 32 ports. A base station may semi-statistically configure a UE withone or more CSI-RS resource sets. One or more CSI-RS resources may beallocated from one or more CSI-RS resource sets to one or more UEs. Forexample, a base station may semi-statistically configure one or moreparameters indicating CSI RS resource mapping, for example, time-domainlocation of one or more CSI-RS resources, a bandwidth of a CSI-RSresource, and/or a periodicity. In an example, a UE may be configured toemploy a same OFDM symbols for downlink CSI-RS 522 and control resourceset (coreset) when the downlink CSI-RS 522 and coreset are spatiallyquasi co-located and resource elements associated with the downlinkCSI-RS 522 are the outside of PRBs configured for coreset. In anexample, a UE may be configured to employ a same OFDM symbols fordownlink CSI-RS 522 and SS/PBCH blocks when the downlink CSI-RS 522 andSS/PBCH blocks are spatially quasi co-located and resource elementsassociated with the downlink CSI-RS 522 are the outside of PRBsconfigured for SS/PBCH blocks.

In an example, a UE may transmit one or more downlink DM-RSs 523 to abase station for channel estimation, for example, for coherentdemodulation of one or more downlink physical channels (e.g., PDSCH514). For example, a radio network may support one or more variableand/or configurable DM-RS patterns for data demodulation. At least onedownlink DM-RS configuration may support a front-loaded DM-RS pattern. Afront-loaded DM-RS may be mapped over one or more OFDM symbols (e.g., 1or 2 adjacent OFDM symbols). A base station may semi-statisticallyconfigure a UE with a maximum number of front-loaded DM-RS symbols forPDSCH 514. For example, a DM-RS configuration may support one or moreDM-RS ports. For example, for single user-MIMO, a DM-RS configurationmay support at least 8 orthogonal downlink DM-RS ports. For example, formultiuser-MIMO, a DM-RS configuration may support 12 orthogonal downlinkDM-RS ports. A radio network may support, e.g., at least for CP-OFDM, acommon DM-RS structure for DL and UL, wherein a DM-RS location, DM-RSpattern, and/or scrambling sequence may be same or different.

In an example, whether downlink PT-RS 524 is present or not may dependon a RRC configuration. For example, a presence of downlink PT-RS 524may be UE-specifically configured. For example, a presence and/or apattern of downlink PT-RS 524 in a scheduled resource may beUE-specifically configured by a combination of RRC signaling and/orassociation with one or more parameters employed for other purposes(e.g., MCS) which may be indicated by DCI. When configured, a dynamicpresence of downlink PT-RS 524 may be associated with one or more DCIparameters comprising at least MCS. A radio network may supportplurality of PT-RS densities defined in time/frequency domain. Whenpresent, a frequency domain density may be associated with at least oneconfiguration of a scheduled bandwidth. A UE may assume a same precodingfor a DMRS port and a PT-RS port. A number of PT-RS ports may be fewerthan a number of DM-RS ports in a scheduled resource. For example,downlink PT-RS 524 may be confined in the scheduled time/frequencyduration for a UE.

FIG. 6 is a diagram depicting an example transmission time and receptiontime for a carrier as per an aspect of an embodiment of the presentdisclosure. A multicarrier OFDM communication system may include one ormore carriers, for example, ranging from 1 to 32 carriers, in case ofcarrier aggregation, or ranging from 1 to 64 carriers, in case of dualconnectivity. Different radio frame structures may be supported (e.g.,for FDD and for TDD duplex mechanisms). FIG. 6 shows an example frametiming. Downlink and uplink transmissions may be organized into radioframes 601. In this example, radio frame duration is 10 ms. In thisexample, a 10 ms radio frame 601 may be divided into ten equally sizedsubframes 602 with 1 ms duration. Subframe(s) may comprise one or moreslots (e.g. slots 603 and 605) depending on subcarrier spacing and/or CPlength. For example, a subframe with 15 kHz, 30 kHz, 60 kHz, 120 kHz,240 kHz and 480 kHz subcarrier spacing may comprise one, two, four,eight, sixteen and thirty-two slots, respectively. In FIG. 6, a subframemay be divided into two equally sized slots 603 with 0.5 ms duration.For example, 10 subframes may be available for downlink transmission and10 subframes may be available for uplink transmissions in a 10 msinterval. Uplink and downlink transmissions may be separated in thefrequency domain. Slot(s) may include a plurality of OFDM symbols 604.The number of OFDM symbols 604 in a slot 605 may depend on the cyclicprefix length. For example, a slot may be 14 OFDM symbols for the samesubcarrier spacing of up to 480 kHz with normal CP. A slot may be 12OFDM symbols for the same subcarrier spacing of 60 kHz with extended CP.A slot may contain downlink, uplink, or a downlink part and an uplinkpart and/or alike.

FIG. 7A is a diagram depicting example sets of OFDM subcarriers as peran aspect of an embodiment of the present disclosure. In the example, agNB may communicate with a wireless device with a carrier with anexample channel bandwidth 700. Arrow(s) in the diagram may depict asubcarrier in a multicarrier OFDM system. The OFDM system may usetechnology such as OFDM technology, SC-FDMA technology, and/or the like.In an example, an arrow 701 shows a subcarrier transmitting informationsymbols. In an example, a subcarrier spacing 702, between two contiguoussubcarriers in a carrier, may be any one of 15 KHz, 30 KHz, 60 KHz, 120KHz, 240 KHz etc. In an example, different subcarrier spacing maycorrespond to different transmission numerologies. In an example, atransmission numerology may comprise at least: a numerology index; avalue of subcarrier spacing; a type of cyclic prefix (CP). In anexample, a gNB may transmit to/receive from a UE on a number ofsubcarriers 703 in a carrier. In an example, a bandwidth occupied by anumber of subcarriers 703 (transmission bandwidth) may be smaller thanthe channel bandwidth 700 of a carrier, due to guard band 704 and 705.In an example, a guard band 704 and 705 may be used to reduceinterference to and from one or more neighbor carriers. A number ofsubcarriers (transmission bandwidth) in a carrier may depend on thechannel bandwidth of the carrier and the subcarrier spacing. Forexample, a transmission bandwidth, for a carrier with 20 MHz channelbandwidth and 15 KHz subcarrier spacing, may be in number of 1024subcarriers.

In an example, a gNB and a wireless device may communicate with multipleCCs when configured with CA. In an example, different component carriersmay have different bandwidth and/or subcarrier spacing, if CA issupported. In an example, a gNB may transmit a first type of service toa UE on a first component carrier. The gNB may transmit a second type ofservice to the UE on a second component carrier. Different type ofservices may have different service requirement (e.g., data rate,latency, reliability), which may be suitable for transmission viadifferent component carrier having different subcarrier spacing and/orbandwidth. FIG. 7B shows an example embodiment. A first componentcarrier may comprise a first number of subcarriers 706 with a firstsubcarrier spacing 709. A second component carrier may comprise a secondnumber of subcarriers 707 with a second subcarrier spacing 710. A thirdcomponent carrier may comprise a third number of subcarriers 708 with athird subcarrier spacing 711. Carriers in a multicarrier OFDMcommunication system may be contiguous carriers, non-contiguouscarriers, or a combination of both contiguous and non-contiguouscarriers.

FIG. 8 is a diagram depicting OFDM radio resources as per an aspect ofan embodiment of the present disclosure. In an example, a carrier mayhave a transmission bandwidth 801. In an example, a resource grid may bein a structure of frequency domain 802 and time domain 803. In anexample, a resource grid may comprise a first number of OFDM symbols ina subframe and a second number of resource blocks, starting from acommon resource block indicated by higher-layer signaling (e.g. RRCsignaling), for a transmission numerology and a carrier. In an example,in a resource grid, a resource unit identified by a subcarrier index anda symbol index may be a resource element 805. In an example, a subframemay comprise a first number of OFDM symbols 807 depending on anumerology associated with a carrier. For example, when a subcarrierspacing of a numerology of a carrier is 15 KHz, a subframe may have 14OFDM symbols for a carrier. When a subcarrier spacing of a numerology is30 KHz, a subframe may have 28 OFDM symbols. When a subcarrier spacingof a numerology is 60 Khz, a subframe may have 56 OFDM symbols, etc. Inan example, a second number of resource blocks comprised in a resourcegrid of a carrier may depend on a bandwidth and a numerology of thecarrier.

As shown in FIG. 8, a resource block 806 may comprise 12 subcarriers. Inan example, multiple resource blocks may be grouped into a ResourceBlock Group (RBG) 804. In an example, a size of a RBG may depend on atleast one of: a RRC message indicating a RBG size configuration; a sizeof a carrier bandwidth; or a size of a bandwidth part of a carrier. Inan example, a carrier may comprise multiple bandwidth parts. A firstbandwidth part of a carrier may have different frequency location and/orbandwidth from a second bandwidth part of the carrier.

In an example, a gNB may transmit a downlink control informationcomprising a downlink or uplink resource block assignment to a wirelessdevice. A base station may transmit to or receive from, a wirelessdevice, data packets (e.g. transport blocks) scheduled and transmittedvia one or more resource blocks and one or more slots according toparameters in a downlink control information and/or RRC message(s). Inan example, a starting symbol relative to a first slot of the one ormore slots may be indicated to the wireless device. In an example, a gNBmay transmit to or receive from, a wireless device, data packetsscheduled on one or more RBGs and one or more slots.

In an example, a gNB may transmit a downlink control informationcomprising a downlink assignment to a wireless device via one or morePDCCHs. The downlink assignment may comprise parameters indicating atleast modulation and coding format; resource allocation; and/or HARQinformation related to DL-SCH. In an example, a resource allocation maycomprise parameters of resource block allocation; and/or slotallocation. In an example, a gNB may dynamically allocate resources to awireless device via a Cell-Radio Network Temporary Identifier (C-RNTI)on one or more PDCCHs. The wireless device may monitor the one or morePDCCHs in order to find possible allocation when its downlink receptionis enabled. The wireless device may receive one or more downlink datapackage on one or more PDSCH scheduled by the one or more PDCCHs, whensuccessfully detecting the one or more PDCCHs.

In an example, a gNB may allocate Configured Scheduling (CS) resourcesfor down link transmission to a wireless device. The gNB may transmitone or more RRC messages indicating a periodicity of the CS grant. ThegNB may transmit a DCI via a PDCCH addressed to a ConfiguredScheduling-RNTI (CS-RNTI) activating the CS resources. The DCI maycomprise parameters indicating that the downlink grant is a CS grant.The CS grant may be implicitly reused according to the periodicitydefined by the one or more RRC messages, until deactivated.

In an example, a gNB may transmit a downlink control informationcomprising an uplink grant to a wireless device via one or more PDCCHs.The uplink grant may comprise parameters indicating at least modulationand coding format; resource allocation; and/or HARQ information relatedto UL-SCH. In an example, a resource allocation may comprise parametersof resource block allocation; and/or slot allocation. In an example, agNB may dynamically allocate resources to a wireless device via a C-RNTIon one or more PDCCHs. The wireless device may monitor the one or morePDCCHs in order to find possible resource allocation. The wirelessdevice may transmit one or more uplink data package via one or morePUSCH scheduled by the one or more PDCCHs, when successfully detectingthe one or more PDCCHs.

In an example, a gNB may allocate CS resources for uplink datatransmission to a wireless device. The gNB may transmit one or more RRCmessages indicating a periodicity of the CS grant. The gNB may transmita DCI via a PDCCH addressed to a CS-RNTI activating the CS resources.The DCI may comprise parameters indicating that the uplink grant is a CSgrant. The CS grant may be implicitly reused according to theperiodicity defined by the one or more RRC message, until deactivated.

In an example, a base station may transmit DCI/control signaling viaPDCCH. The DCI may take a format in a plurality of formats. A DCI maycomprise downlink and/or uplink scheduling information (e.g., resourceallocation information, HARQ related parameters, MCS), request for CSI(e.g., aperiodic CQI reports), request for SRS, uplink power controlcommands for one or more cells, one or more timing information (e.g., TBtransmission/reception timing, HARQ feedback timing, etc.), etc. In anexample, a DCI may indicate an uplink grant comprising transmissionparameters for one or more transport blocks. In an example, a DCI mayindicate downlink assignment indicating parameters for receiving one ormore transport blocks. In an example, a DCI may be used by base stationto initiate a contention-free random access at the wireless device. Inan example, the base station may transmit a DCI comprising slot formatindicator (SFI) notifying a slot format. In an example, the base stationmay transmit a DCI comprising pre-emption indication notifying thePRB(s) and/or OFDM symbol(s) where a UE may assume no transmission isintended for the UE. In an example, the base station may transmit a DCIfor group power control of PUCCH or PUSCH or SRS. In an example, a DCImay correspond to an RNTI. In an example, the wireless device may obtainan RNTI in response to completing the initial access (e.g., C-RNTI). Inan example, the base station may configure an RNTI for the wireless(e.g., CS-RNTI, TPC-CS-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI,TPC-SRS-RNTI). In an example, the wireless device may compute an RNTI(e.g., the wireless device may compute RA-RNTI based on resources usedfor transmission of a preamble). In an example, an RNTI may have apre-configured value (e.g., P-RNTI or SI-RNTI). In an example, awireless device may monitor a group common search space which may beused by base station for transmitting DCIs that are intended for a groupof UEs. In an example, a group common DCI may correspond to an RNTIwhich is commonly configured for a group of UEs. In an example, awireless device may monitor a UE-specific search space. In an example, aUE specific DCI may correspond to an RNTI configured for the wirelessdevice.

A NR system may support a single beam operation and/or a multi-beamoperation. In a multi-beam operation, a base station may perform adownlink beam sweeping to provide coverage for common control channelsand/or downlink SS blocks, which may comprise at least a PSS, a SSS,and/or PBCH. A wireless device may measure quality of a beam pair linkusing one or more RS s. One or more SS blocks, or one or more CSI-RSresources, associated with a CSI-RS resource index (CRI), or one or moreDM-RSs of PBCH, may be used as RS for measuring quality of a beam pairlink. Quality of a beam pair link may be defined as a reference signalreceived power (RSRP) value, or a reference signal received quality(RSRQ) value, and/or a CSI value measured on RS resources. The basestation may indicate whether an RS resource, used for measuring a beampair link quality, is quasi-co-located (QCLed) with DM-RSs of a controlchannel. A RS resource and DM-RSs of a control channel may be calledQCLed when a channel characteristics from a transmission on an RS to awireless device, and that from a transmission on a control channel to awireless device, are similar or same under a configured criterion. In amulti-beam operation, a wireless device may perform an uplink beamsweeping to access a cell.

In an example, a wireless device may be configured to monitor PDCCH onone or more beam pair links simultaneously depending on a capability ofa wireless device. This may increase robustness against beam pair linkblocking. A base station may transmit one or more messages to configurea wireless device to monitor PDCCH on one or more beam pair links indifferent PDCCH OFDM symbols. For example, a base station may transmithigher layer signaling (e.g. RRC signaling) or MAC CE comprisingparameters related to the Rx beam setting of a wireless device formonitoring PDCCH on one or more beam pair links. A base station maytransmit indication of spatial QCL assumption between an DL RS antennaport(s) (for example, cell-specific CSI-RS, or wireless device-specificCSI-RS, or SS block, or PBCH with or without DM-RSs of PBCH), and DL RSantenna port(s) for demodulation of DL control channel. Signaling forbeam indication for a PDCCH may be MAC CE signaling, or RRC signaling,or DCI signaling, or specification-transparent and/or implicit method,and combination of these signaling methods.

For reception of unicast DL data channel, a base station may indicatespatial QCL parameters between DL RS antenna port(s) and DM-RS antennaport(s) of DL data channel. The base station may transmit DCI (e.g.downlink grants) comprising information indicating the RS antennaport(s). The information may indicate RS antenna port(s) which may beQCLed with the DM-RS antenna port(s). Different set of DM-RS antennaport(s) for a DL data channel may be indicated as QCL with different setof the RS antenna port(s).

FIG. 9A is an example of beam sweeping in a DL channel. In anRRC_INACTIVE state or RRC_IDLE state, a wireless device may assume thatSS blocks form an SS burst 940, and an SS burst set 950. The SS burstset 950 may have a given periodicity. For example, in a multi-beamoperation, a base station 120 may transmit SS blocks in multiple beams,together forming a SS burst 940. One or more SS blocks may betransmitted on one beam. If multiple SS bursts 940 are transmitted withmultiple beams, SS bursts together may form SS burst set 950.

A wireless device may further use CSI-RS in the multi-beam operation forestimating a beam quality of a links between a wireless device and abase station. A beam may be associated with a CSI-RS. For example, awireless device may, based on a RSRP measurement on CSI-RS, report abeam index, as indicated in a CRI for downlink beam selection, andassociated with a RSRP value of a beam. A CSI-RS may be transmitted on aCSI-RS resource including at least one of one or more antenna ports, oneor more time or frequency radio resources. A CSI-RS resource may beconfigured in a cell-specific way by common RRC signaling, or in awireless device-specific way by dedicated RRC signaling, and/or L1/L2signaling. Multiple wireless devices covered by a cell may measure acell-specific CSI-RS resource. A dedicated subset of wireless devicescovered by a cell may measure a wireless device-specific CSI-RSresource.

A CSI-RS resource may be transmitted periodically, or using aperiodictransmission, or using a multi-shot or semi-persistent transmission. Forexample, in a periodic transmission in FIG. 9A, a base station 120 maytransmit configured CSI-RS resources 940 periodically using a configuredperiodicity in a time domain. In an aperiodic transmission, a configuredCSI-RS resource may be transmitted in a dedicated time slot. In amulti-shot or semi-persistent transmission, a configured CSI-RS resourcemay be transmitted within a configured period. Beams used for CSI-RStransmission may have different beam width than beams used for SS-blockstransmission.

FIG. 9B is an example of a beam management procedure in an example newradio network. A base station 120 and/or a wireless device 110 mayperform a downlink L1/L2 beam management procedure. One or more of thefollowing downlink L1/L2 beam management procedures may be performedwithin one or more wireless devices 110 and one or more base stations120. In an example, a P-1 procedure 910 may be used to enable thewireless device 110 to measure one or more Transmission (Tx) beamsassociated with the base station 120 to support a selection of a firstset of Tx beams associated with the base station 120 and a first set ofRx beam(s) associated with a wireless device 110. For beamforming at abase station 120, a base station 120 may sweep a set of different TXbeams. For beamforming at a wireless device 110, a wireless device 110may sweep a set of different Rx beams. In an example, a P-2 procedure920 may be used to enable a wireless device 110 to measure one or moreTx beams associated with a base station 120 to possibly change a firstset of Tx beams associated with a base station 120. A P-2 procedure 920may be performed on a possibly smaller set of beams for beam refinementthan in the P-1 procedure 910. A P-2 procedure 920 may be a special caseof a P-1 procedure 910. In an example, a P-3 procedure 930 may be usedto enable a wireless device 110 to measure at least one Tx beamassociated with a base station 120 to change a first set of Rx beamsassociated with a wireless device 110.

A wireless device 110 may transmit one or more beam management reportsto a base station 120. In one or more beam management reports, awireless device 110 may indicate some beam pair quality parameters,comprising at least, one or more beam identifications; RSRP; PrecodingMatrix Indicator (PMI)/Channel Quality Indicator (CQI)/Rank Indicator(RI) of a subset of configured beams. Based on one or more beammanagement reports, a base station 120 may transmit to a wireless device110 a signal indicating that one or more beam pair links are one or moreserving beams. A base station 120 may transmit PDCCH and PDSCH for awireless device 110 using one or more serving beams.

In an example embodiment, new radio network may support a BandwidthAdaptation (BA). In an example, receive and/or transmit bandwidthsconfigured by an UE employing a BA may not be large. For example, areceive and/or transmit bandwidths may not be as large as a bandwidth ofa cell. Receive and/or transmit bandwidths may be adjustable. Forexample, a UE may change receive and/or transmit bandwidths, e.g., toshrink during period of low activity to save power. For example, a UEmay change a location of receive and/or transmit bandwidths in afrequency domain, e.g. to increase scheduling flexibility. For example,a UE may change a subcarrier spacing, e.g. to allow different services.

In an example embodiment, a subset of a total cell bandwidth of a cellmay be referred to as a Bandwidth Part (BWP). A base station mayconfigure a UE with one or more BWPs to achieve a BA. For example, abase station may indicate, to a UE, which of the one or more(configured) BWPs is an active BWP.

FIG. 10 is an example diagram of 3 BWPs configured: BWP1 (1010 and 1050)with a width of 40 MHz and subcarrier spacing of 15 kHz; BWP2 (1020 and1040) with a width of 10 MHz and subcarrier spacing of 15 kHz; BWP3 1030with a width of 20 MHz and subcarrier spacing of 60 kHz.

In an example, a UE, configured for operation in one or more BWPs of acell, may be configured by one or more higher layers (e.g. RRC layer)for a cell a set of one or more BWPs (e.g., at most four BWPs) forreceptions by the UE (DL BWP set) in a DL bandwidth by at least oneparameter DL-BWP and a set of one or more BWPs (e.g., at most four BWPs)for transmissions by a UE (UL BWP set) in an UL bandwidth by at leastone parameter UL-BWP for a cell.

To enable BA on the PCell, a base station may configure a UE with one ormore UL and DL BWP pairs. To enable BA on SCells (e.g., in case of CA),a base station may configure a UE at least with one or more DL BWPs(e.g., there may be none in an UL).

In an example, an initial active DL BWP may be defined by at least oneof a location and number of contiguous PRBs, a subcarrier spacing, or acyclic prefix, for a control resource set for at least one common searchspace. For operation on the PCell, one or more higher layer parametersmay indicate at least one initial UL BWP for a random access procedure.If a UE is configured with a secondary carrier on a primary cell, the UEmay be configured with an initial BWP for random access procedure on asecondary carrier.

In an example, for unpaired spectrum operation, a UE may expect that acenter frequency for a DL BWP may be same as a center frequency for a ULBWP.

For example, for a DL BWP or an UL BWP in a set of one or more DL BWPsor one or more UL BWPs, respectively, a base station maysemi-statistically configure a UE for a cell with one or more parametersindicating at least one of following: a subcarrier spacing; a cyclicprefix; a number of contiguous PRBs; an index in the set of one or moreDL BWPs and/or one or more UL BWPs; a link between a DL BWP and an ULBWP from a set of configured DL BWPs and UL BWPs; a DCI detection to aPDSCH reception timing; a PDSCH reception to a HARQ-ACK transmissiontiming value; a DCI detection to a PUSCH transmission timing value; anoffset of a first PRB of a DL bandwidth or an UL bandwidth,respectively, relative to a first PRB of a bandwidth.

In an example, for a DL BWP in a set of one or more DL BWPs on a PCell,a base station may configure a UE with one or more control resource setsfor at least one type of common search space and/or one UE-specificsearch space. For example, a base station may not configure a UE withouta common search space on a PCell, or on a PSCell, in an active DL BWP.

For an UL BWP in a set of one or more UL BWPs, a base station mayconfigure a UE with one or more resource sets for one or more PUCCHtransmissions.

In an example, if a DCI comprises a BWP indicator field, a BWP indicatorfield value may indicate an active DL BWP, from a configured DL BWP set,for one or more DL receptions. If a DCI comprises a BWP indicator field,a BWP indicator field value may indicate an active UL BWP, from aconfigured UL BWP set, for one or more UL transmissions.

In an example, for a PCell, a base station may semi-statisticallyconfigure a UE with a default DL BWP among configured DL BWPs. If a UEis not provided a default DL BWP, a default BWP may be an initial activeDL BWP.

In an example, a base station may configure a UE with a timer value fora PCell. For example, a UE may start a timer, referred to as BWPinactivity timer, when a UE detects a DCI indicating an active DL BWP,other than a default DL BWP, for a paired spectrum operation or when aUE detects a DCI indicating an active DL BWP or UL BWP, other than adefault DL BWP or UL BWP, for an unpaired spectrum operation. The UE mayincrement the timer by an interval of a first value (e.g., the firstvalue may be 1 millisecond or 0.5 milliseconds) if the UE does notdetect a DCI during the interval for a paired spectrum operation or foran unpaired spectrum operation. In an example, the timer may expire whenthe timer is equal to the timer value. A UE may switch to the default DLBWP from an active DL BWP when the timer expires.

In an example, a base station may semi-statistically configure a UE withone or more BWPs. A UE may switch an active BWP from a first BWP to asecond BWP in response to receiving a DCI indicating the second BWP asan active BWP and/or in response to an expiry of BWP inactivity timer(for example, the second BWP may be a default BWP). For example, FIG. 10is an example diagram of 3 BWPs configured, BWP1 (1010 and 1050), BWP2(1020 and 1040), and BWP3 (1030). BWP2 (1020 and 1040) may be a defaultBWP. BWP1 (1010) may be an initial active BWP. In an example, a UE mayswitch an active BWP from BWP1 1010 to BWP2 1020 in response to anexpiry of BWP inactivity timer. For example, a UE may switch an activeBWP from BWP2 1020 to BWP3 1030 in response to receiving a DCIindicating BWP3 1030 as an active BWP. Switching an active BWP from BWP31030 to BWP2 1040 and/or from BWP2 1040 to BWP1 1050 may be in responseto receiving a DCI indicating an active BWP and/or in response to anexpiry of BWP inactivity timer.

In an example, if a UE is configured for a secondary cell with a defaultDL BWP among configured DL BWPs and a timer value, UE procedures on asecondary cell may be same as on a primary cell using the timer valuefor the secondary cell and the default DL BWP for the secondary cell.

In an example, if a base station configures a UE with a first active DLBWP and a first active UL BWP on a secondary cell or carrier, a UE mayemploy an indicated DL BWP and an indicated UL BWP on a secondary cellas a respective first active DL BWP and first active UL BWP on asecondary cell or carrier.

FIG. 11A and FIG. 11B show packet flows employing a multi connectivity(e.g. dual connectivity, multi connectivity, tight interworking, and/orthe like). FIG. 11A is an example diagram of a protocol structure of awireless device 110 (e.g. UE) with CA and/or multi connectivity as peran aspect of an embodiment. FIG. 11B is an example diagram of a protocolstructure of multiple base stations with CA and/or multi connectivity asper an aspect of an embodiment. The multiple base stations may comprisea master node, MN 1130 (e.g. a master node, a master base station, amaster gNB, a master eNB, and/or the like) and a secondary node, SN 1150(e.g. a secondary node, a secondary base station, a secondary gNB, asecondary eNB, and/or the like). A master node 1130 and a secondary node1150 may co-work to communicate with a wireless device 110.

When multi connectivity is configured for a wireless device 110, thewireless device 110, which may support multiple reception/transmissionfunctions in an RRC connected state, may be configured to utilize radioresources provided by multiple schedulers of a multiple base stations.Multiple base stations may be inter-connected via a non-ideal or idealbackhaul (e.g. Xn interface, X2 interface, and/or the like). A basestation involved in multi connectivity for a certain wireless device mayperform at least one of two different roles: a base station may eitheract as a master base station or as a secondary base station. In multiconnectivity, a wireless device may be connected to one master basestation and one or more secondary base stations. In an example, a masterbase station (e.g. the MN 1130) may provide a master cell group (MCG)comprising a primary cell and/or one or more secondary cells for awireless device (e.g. the wireless device 110). A secondary base station(e.g. the SN 1150) may provide a secondary cell group (SCG) comprising aprimary secondary cell (PSCell) and/or one or more secondary cells for awireless device (e.g. the wireless device 110).

In multi connectivity, a radio protocol architecture that a beareremploys may depend on how a bearer is setup. In an example, threedifferent type of bearer setup options may be supported: an MCG bearer,an SCG bearer, and/or a split bearer. A wireless device mayreceive/transmit packets of an MCG bearer via one or more cells of theMCG, and/or may receive/transmits packets of an SCG bearer via one ormore cells of an SCG. Multi-connectivity may also be described as havingat least one bearer configured to use radio resources provided by thesecondary base station. Multi-connectivity may or may not beconfigured/implemented in some of the example embodiments.

In an example, a wireless device (e.g. Wireless Device 110) may transmitand/or receive: packets of an MCG bearer via an SDAP layer (e.g. SDAP1110), a PDCP layer (e.g. NR PDCP 1111), an RLC layer (e.g. MN RLC1114), and a MAC layer (e.g. MN MAC 1118); packets of a split bearer viaan SDAP layer (e.g. SDAP 1110), a PDCP layer (e.g. NR PDCP 1112), one ofa master or secondary RLC layer (e.g. MN RLC 1115, SN RLC 1116), and oneof a master or secondary MAC layer (e.g. MN MAC 1118, SN MAC 1119);and/or packets of an SCG bearer via an SDAP layer (e.g. SDAP 1110), aPDCP layer (e.g. NR PDCP 1113), an RLC layer (e.g. SN RLC 1117), and aMAC layer (e.g. MN MAC 1119).

In an example, a master base station (e.g. MN 1130) and/or a secondarybase station (e.g. SN 1150) may transmit/receive: packets of an MCGbearer via a master or secondary node SDAP layer (e.g. SDAP 1120, SDAP1140), a master or secondary node PDCP layer (e.g. NR PDCP 1121, NR PDCP1142), a master node RLC layer (e.g. MN RLC 1124, MN RLC 1125), and amaster node MAC layer (e.g. MN MAC 1128); packets of an SCG bearer via amaster or secondary node SDAP layer (e.g. SDAP 1120, SDAP 1140), amaster or secondary node PDCP layer (e.g. NR PDCP 1122, NR PDCP 1143), asecondary node RLC layer (e.g. SN RLC 1146, SN RLC 1147), and asecondary node MAC layer (e.g. SN MAC 1148); packets of a split bearervia a master or secondary node SDAP layer (e.g. SDAP 1120, SDAP 1140), amaster or secondary node PDCP layer (e.g. NR PDCP 1123, NR PDCP 1141), amaster or secondary node RLC layer (e.g. MN RLC 1126, SN RLC 1144, SNRLC 1145, MN RLC 1127), and a master or secondary node MAC layer (e.g.MN MAC 1128, SN MAC 1148).

In multi connectivity, a wireless device may configure multiple MACentities: one MAC entity (e.g. MN MAC 1118) for a master base station,and other MAC entities (e.g. SN MAC 1119) for a secondary base station.In multi-connectivity, a configured set of serving cells for a wirelessdevice may comprise two subsets: an MCG comprising serving cells of amaster base station, and SCGs comprising serving cells of a secondarybase station. For an SCG, one or more of following configurations may beapplied: at least one cell of an SCG has a configured UL CC and at leastone cell of a SCG, named as primary secondary cell (PSCell, PCell ofSCG, or sometimes called PCell), is configured with PUCCH resources;when an SCG is configured, there may be at least one SCG bearer or oneSplit bearer; upon detection of a physical layer problem or a randomaccess problem on a PSCell, or a number of NR RLC retransmissions hasbeen reached associated with the SCG, or upon detection of an accessproblem on a PSCell during a SCG addition or a SCG change: an RRCconnection re-establishment procedure may not be triggered, ULtransmissions towards cells of an SCG may be stopped, a master basestation may be informed by a wireless device of a SCG failure type, forsplit bearer, a DL data transfer over a master base station may bemaintained; an NR RLC acknowledged mode (AM) bearer may be configuredfor a split bearer; PCell and/or PSCell may not be de-activated; PSCellmay be changed with a SCG change procedure (e.g. with security keychange and a RACH procedure); and/or a bearer type change between asplit bearer and a SCG bearer or simultaneous configuration of a SCG anda split bearer may or may not supported.

With respect to interaction between a master base station and asecondary base stations for multi-connectivity, one or more of thefollowing may be applied: a master base station and/or a secondary basestation may maintain RRM measurement configurations of a wirelessdevice; a master base station may (e.g. based on received measurementreports, traffic conditions, and/or bearer types) may decide to requesta secondary base station to provide additional resources (e.g. servingcells) for a wireless device; upon receiving a request from a masterbase station, a secondary base station may create/modify a containerthat may result in configuration of additional serving cells for awireless device (or decide that the secondary base station has noresource available to do so); for a UE capability coordination, a masterbase station may provide (a part of) an AS configuration and UEcapabilities to a secondary base station; a master base station and asecondary base station may exchange information about a UE configurationby employing of RRC containers (inter-node messages) carried via Xnmessages; a secondary base station may initiate a reconfiguration of thesecondary base station existing serving cells (e.g. PUCCH towards thesecondary base station); a secondary base station may decide which cellis a PSCell within a SCG; a master base station may or may not changecontent of RRC configurations provided by a secondary base station; incase of a SCG addition and/or a SCG SCell addition, a master basestation may provide recent (or the latest) measurement results for SCGcell(s); a master base station and secondary base stations may receiveinformation of SFN and/or subframe offset of each other from OAM and/orvia an Xn interface, (e.g. for a purpose of DRX alignment and/oridentification of a measurement gap). In an example, when adding a newSCG SCell, dedicated RRC signaling may be used for sending requiredsystem information of a cell as for CA, except for a SFN acquired from aMIB of a PSCell of a SCG.

FIG. 12 is an example diagram of a random access procedure. One or moreevents may trigger a random access procedure. For example, one or moreevents may be at least one of following: initial access from RRC_IDLE,RRC connection re-establishment procedure, handover, DL or UL dataarrival during RRC_CONNECTED when UL synchronization status isnon-synchronized, transition from RRC_Inactive, and/or request for othersystem information. For example, a PDCCH order, a MAC entity, and/or abeam failure indication may initiate a random access procedure.

In an example embodiment, a random access procedure may be at least oneof a contention based random access procedure and a contention freerandom access procedure. For example, a contention based random accessprocedure may comprise, one or more Msg 1 1220 transmissions, one ormore Msg2 1230 transmissions, one or more Msg3 1240 transmissions, andcontention resolution 1250. For example, a contention free random accessprocedure may comprise one or more Msg 1 1220 transmissions and one ormore Msg2 1230 transmissions.

In an example, a base station may transmit (e.g., unicast, multicast, orbroadcast), to a UE, a RACH configuration 1210 via one or more beams.The RACH configuration 1210 may comprise one or more parametersindicating at least one of following: available set of PRACH resourcesfor a transmission of a random access preamble, initial preamble power(e.g., random access preamble initial received target power), an RSRPthreshold for a selection of a SS block and corresponding PRACHresource, a power-ramping factor (e.g., random access preamble powerramping step), random access preamble index, a maximum number ofpreamble transmission, preamble group A and group B, a threshold (e.g.,message size) to determine the groups of random access preambles, a setof one or more random access preambles for system information requestand corresponding PRACH resource(s), if any, a set of one or more randomaccess preambles for beam failure recovery request and correspondingPRACH resource(s), if any, a time window to monitor RA response(s), atime window to monitor response(s) on beam failure recovery request,and/or a contention resolution timer.

In an example, the Msg1 1220 may be one or more transmissions of arandom access preamble. For a contention based random access procedure,a UE may select a SS block with a RSRP above the RSRP threshold. Ifrandom access preambles group B exists, a UE may select one or morerandom access preambles from a group A or a group B depending on apotential Msg3 1240 size. If a random access preambles group B does notexist, a UE may select the one or more random access preambles from agroup A. A UE may select a random access preamble index randomly (e.g.with equal probability or a normal distribution) from one or more randomaccess preambles associated with a selected group. If a base stationsemi-statistically configures a UE with an association between randomaccess preambles and SS blocks, the UE may select a random accesspreamble index randomly with equal probability from one or more randomaccess preambles associated with a selected SS block and a selectedgroup.

For example, a UE may initiate a contention free random access procedurebased on a beam failure indication from a lower layer. For example, abase station may semi-statistically configure a UE with one or morecontention free PRACH resources for beam failure recovery requestassociated with at least one of SS blocks and/or CSI-RSs. If at leastone of SS blocks with a RSRP above a first RSRP threshold amongstassociated SS blocks or at least one of CSI-RSs with a RSRP above asecond RSRP threshold amongst associated CSI-RSs is available, a UE mayselect a random access preamble index corresponding to a selected SSblock or CSI-RS from a set of one or more random access preambles forbeam failure recovery request.

For example, a UE may receive, from a base station, a random accesspreamble index via PDCCH or RRC for a contention free random accessprocedure. If a base station does not configure a UE with at least onecontention free PRACH resource associated with SS blocks or CSI-RS, theUE may select a random access preamble index. If a base stationconfigures a UE with one or more contention free PRACH resourcesassociated with SS blocks and at least one SS block with a RSRP above afirst RSRP threshold amongst associated SS blocks is available, the UEmay select the at least one SS block and select a random access preamblecorresponding to the at least one SS block. If a base station configuresa UE with one or more contention free PRACH resources associated withCSI-RSs and at least one CSI-RS with a RSRP above a second RSPRthreshold amongst the associated CSI-RSs is available, the UE may selectthe at least one CSI-RS and select a random access preamblecorresponding to the at least one CSI-RS.

A UE may perform one or more Msg1 1220 transmissions by transmitting theselected random access preamble. For example, if a UE selects an SSblock and is configured with an association between one or more PRACHoccasions and one or more SS blocks, the UE may determine an PRACHoccasion from one or more PRACH occasions corresponding to a selected SSblock. For example, if a UE selects a CSI-RS and is configured with anassociation between one or more PRACH occasions and one or more CSI-RSs,the UE may determine a PRACH occasion from one or more PRACH occasionscorresponding to a selected CSI-RS. A UE may transmit, to a basestation, a selected random access preamble via a selected PRACHoccasions. A UE may determine a transmit power for a transmission of aselected random access preamble at least based on an initial preamblepower and a power-ramping factor. A UE may determine a RA-RNTIassociated with a selected PRACH occasions in which a selected randomaccess preamble is transmitted. For example, a UE may not determine aRA-RNTI for a beam failure recovery request. A UE may determine anRA-RNTI at least based on an index of a first OFDM symbol and an indexof a first slot of a selected PRACH occasions, and/or an uplink carrierindex for a transmission of Msg1 1220.

In an example, a UE may receive, from a base station, a random accessresponse, Msg 2 1230. A UE may start a time window (e.g.,ra-ResponseWindow) to monitor a random access response. For beam failurerecovery request, a base station may configure a UE with a differenttime window (e.g., bfr-ResponseWindow) to monitor response on beamfailure recovery request. For example, a UE may start a time window(e.g., ra-ResponseWindow or bfr-ResponseWindow) at a start of a firstPDCCH occasion after a fixed duration of one or more symbols from an endof a preamble transmission. If a UE transmits multiple preambles, the UEmay start a time window at a start of a first PDCCH occasion after afixed duration of one or more symbols from an end of a first preambletransmission. A UE may monitor a PDCCH of a cell for at least one randomaccess response identified by a RA-RNTI or for at least one response tobeam failure recovery request identified by a C-RNTI while a timer for atime window is running.

In an example, a UE may consider a reception of random access responsesuccessful if at least one random access response comprises a randomaccess preamble identifier corresponding to a random access preambletransmitted by the UE. A UE may consider the contention free randomaccess procedure successfully completed if a reception of random accessresponse is successful. If a contention free random access procedure istriggered for a beam failure recovery request, a UE may consider acontention free random access procedure successfully complete if a PDCCHtransmission is addressed to a C-RNTI. In an example, if at least onerandom access response comprises a random access preamble identifier, aUE may consider the random access procedure successfully completed andmay indicate a reception of an acknowledgement for a system informationrequest to upper layers. If a UE has signaled multiple preambletransmissions, the UE may stop transmitting remaining preambles (if any)in response to a successful reception of a corresponding random accessresponse.

In an example, a UE may perform one or more Msg 3 1240 transmissions inresponse to a successful reception of random access response (e.g., fora contention based random access procedure). A UE may adjust an uplinktransmission timing based on a timing advanced command indicated by arandom access response and may transmit one or more transport blocksbased on an uplink grant indicated by a random access response.Subcarrier spacing for PUSCH transmission for Msg3 1240 may be providedby at least one higher layer (e.g. RRC) parameter. A UE may transmit arandom access preamble via PRACH and Msg3 1240 via PUSCH on a same cell.A base station may indicate an UL BWP for a PUSCH transmission of Msg31240 via system information block. A UE may employ HARQ for aretransmission of Msg 3 1240.

In an example, multiple UEs may perform Msg 1 1220 by transmitting asame preamble to a base station and receive, from the base station, asame random access response comprising an identity (e.g., TC-RNTI).Contention resolution 1250 may ensure that a UE does not incorrectly usean identity of another UE. For example, contention resolution 1250 maybe based on C-RNTI on PDCCH or a UE contention resolution identity onDL-SCH. For example, if a base station assigns a C-RNTI to a UE, the UEmay perform contention resolution 1250 based on a reception of a PDCCHtransmission that is addressed to the C-RNTI. In response to detectionof a C-RNTI on a PDCCH, a UE may consider contention resolution 1250successful and may consider a random access procedure successfullycompleted. If a UE has no valid C-RNTI, a contention resolution may beaddressed by employing a TC-RNTI. For example, if a MAC PDU issuccessfully decoded and a MAC PDU comprises a UE contention resolutionidentity MAC CE that matches the CCCH SDU transmitted in Msg3 1250, a UEmay consider the contention resolution 1250 successful and may considerthe random access procedure successfully completed.

FIG. 13 is an example structure for MAC entities as per an aspect of anembodiment. In an example, a wireless device may be configured tooperate in a multi-connectivity mode. A wireless device in RRC_CONNECTEDwith multiple RX/TX may be configured to utilize radio resourcesprovided by multiple schedulers located in a plurality of base stations.The plurality of base stations may be connected via a non-ideal or idealbackhaul over the Xn interface. In an example, a base station in aplurality of base stations may act as a master base station or as asecondary base station. A wireless device may be connected to one masterbase station and one or more secondary base stations. A wireless devicemay be configured with multiple MAC entities, e.g. one MAC entity formaster base station, and one or more other MAC entities for secondarybase station(s). In an example, a configured set of serving cells for awireless device may comprise two subsets: an MCG comprising servingcells of a master base station, and one or more SCGs comprising servingcells of a secondary base station(s). FIG. 13 illustrates an examplestructure for MAC entities when MCG and SCG are configured for awireless device.

In an example, at least one cell in a SCG may have a configured UL CC,wherein a cell of at least one cell may be called PSCell or PCell ofSCG, or sometimes may be simply called PCell. A PSCell may be configuredwith PUCCH resources. In an example, when a SCG is configured, there maybe at least one SCG bearer or one split bearer. In an example, upondetection of a physical layer problem or a random access problem on aPSCell, or upon reaching a number of RLC retransmissions associated withthe SCG, or upon detection of an access problem on a PSCell during a SCGaddition or a SCG change: an RRC connection re-establishment proceduremay not be triggered, UL transmissions towards cells of an SCG may bestopped, a master base station may be informed by a UE of a SCG failuretype and DL data transfer over a master base station may be maintained.

In an example, a MAC sublayer may provide services such as data transferand radio resource allocation to upper layers (e.g. 1310 or 1320). A MACsublayer may comprise a plurality of MAC entities (e.g. 1350 and 1360).A MAC sublayer may provide data transfer services on logical channels.To accommodate different kinds of data transfer services, multiple typesof logical channels may be defined. A logical channel may supporttransfer of a particular type of information. A logical channel type maybe defined by what type of information (e.g., control or data) istransferred. For example, BCCH, PCCH, CCCH and DCCH may be controlchannels and DTCH may be a traffic channel. In an example, a first MACentity (e.g. 1310) may provide services on PCCH, BCCH, CCCH, DCCH, DTCHand MAC control elements. In an example, a second MAC entity (e.g. 1320)may provide services on BCCH, DCCH, DTCH and MAC control elements.

A MAC sublayer may expect from a physical layer (e.g. 1330 or 1340)services such as data transfer services, signaling of HARQ feedback,signaling of scheduling request or measurements (e.g. CQI). In anexample, in dual connectivity, two MAC entities may be configured for awireless device: one for MCG and one for SCG. A MAC entity of wirelessdevice may handle a plurality of transport channels. In an example, afirst MAC entity may handle first transport channels comprising a PCCHof MCG, a first BCH of MCG, one or more first DL-SCHs of MCG, one ormore first UL-SCHs of MCG and one or more first RACHs of MCG. In anexample, a second MAC entity may handle second transport channelscomprising a second BCH of SCG, one or more second DL-SCHs of SCG, oneor more second UL-SCHs of SCG and one or more second RACHs of SCG.

In an example, if a MAC entity is configured with one or more SCells,there may be multiple DL-SCHs and there may be multiple UL-SCHs as wellas multiple RACHs per MAC entity. In an example, there may be one DL-SCHand UL-SCH on a SpCell. In an example, there may be one DL-SCH, zero orone UL-SCH and zero or one RACH for an SCell. A DL-SCH may supportreceptions using different numerologies and/or TTI duration within a MACentity. A UL-SCH may also support transmissions using differentnumerologies and/or TTI duration within the MAC entity.

In an example, a MAC sublayer may support different functions and maycontrol these functions with a control (e.g. 1355 or 1365) element.Functions performed by a MAC entity may comprise mapping between logicalchannels and transport channels (e.g., in uplink or downlink),multiplexing (e.g. 1352 or 1362) of MAC SDUs from one or differentlogical channels onto transport blocks (TB) to be delivered to thephysical layer on transport channels (e.g., in uplink), demultiplexing(e.g. 1352 or 1362) of MAC SDUs to one or different logical channelsfrom transport blocks (TB) delivered from the physical layer ontransport channels (e.g., in downlink), scheduling information reporting(e.g., in uplink), error correction through HARQ in uplink or downlink(e.g. 1363), and logical channel prioritization in uplink (e.g. 1351 or1361). A MAC entity may handle a random access process (e.g. 1354 or1364).

FIG. 14 is an example diagram of a RAN architecture comprising one ormore base stations. In an example, a protocol stack (e.g. RRC, SDAP,PDCP, RLC, MAC, and PHY) may be supported at a node. A base station(e.g. gNB 120A or 120B) may comprise a base station central unit (CU)(e.g. gNB-CU 1420A or 1420B) and at least one base station distributedunit (DU) (e.g. gNB-DU 1430A, 1430B, 1430C, or 1430D) if a functionalsplit is configured. Upper protocol layers of a base station may belocated in a base station CU, and lower layers of the base station maybe located in the base station DUs. An F1 interface (e.g. CU-DUinterface) connecting a base station CU and base station DUs may be anideal or non-ideal backhaul. F1-C may provide a control plane connectionover an F1 interface, and F1-U may provide a user plane connection overthe F1 interface. In an example, an Xn interface may be configuredbetween base station CUs.

In an example, a base station CU may comprise an RRC function, an SDAPlayer, and a PDCP layer, and base station DUs may comprise an RLC layer,a MAC layer, and a PHY layer. In an example, various functional splitoptions between a base station CU and base station DUs may be possibleby locating different combinations of upper protocol layers (RANfunctions) in a base station CU and different combinations of lowerprotocol layers (RAN functions) in base station DUs. A functional splitmay support flexibility to move protocol layers between a base stationCU and base station DUs depending on service requirements and/or networkenvironments.

In an example, functional split options may be configured per basestation, per base station CU, per base station DU, per UE, per bearer,per slice, or with other granularities. In per base station CU split, abase station CU may have a fixed split option, and base station DUs maybe configured to match a split option of a base station CU. In per basestation DU split, a base station DU may be configured with a differentsplit option, and a base station CU may provide different split optionsfor different base station DUs. In per UE split, a base station (basestation CU and at least one base station DUs) may provide differentsplit options for different wireless devices. In per bearer split,different split options may be utilized for different bearers. In perslice splice, different split options may be applied for differentslices.

FIG. 15 is an example diagram showing RRC state transitions of awireless device. In an example, a wireless device may be in at least oneRRC state among an RRC connected state (e.g. RRC_Connected 1530,RRC_Connected), an RRC idle state (e.g. RRC_Idle 1510, RRC_Idle), and/oran RRC inactive state (e.g. RRC_Inactive 1520, RRC_Inactive). In anexample, in an RRC connected state, a wireless device may have at leastone RRC connection with at least one base station (e.g. gNB and/or eNB),which may have a UE context of the wireless device. A UE context (e.g. awireless device context) may comprise at least one of an access stratumcontext, one or more radio link configuration parameters, bearer (e.g.data radio bearer (DRB), signaling radio bearer (SRB), logical channel,QoS flow, PDU session, and/or the like) configuration information,security information, PHY/MAC/RLC/PDCP/SDAP layer configurationinformation, and/or the like configuration information for a wirelessdevice. In an example, in an RRC idle state, a wireless device may nothave an RRC connection with a base station, and a UE context of awireless device may not be stored in a base station. In an example, inan RRC inactive state, a wireless device may not have an RRC connectionwith a base station. A UE context of a wireless device may be stored ina base station, which may be called as an anchor base station (e.g. lastserving base station).

In an example, a wireless device may transition a UE RRC state betweenan RRC idle state and an RRC connected state in both ways (e.g.connection release 1540 or connection establishment 1550; or connectionreestablishment) and/or between an RRC inactive state and an RRCconnected state in both ways (e.g. connection inactivation 1570 orconnection resume 1580). In an example, a wireless device may transitionits RRC state from an RRC inactive state to an RRC idle state (e.g.connection release 1560).

In an example, an anchor base station may be a base station that maykeep a UE context (a wireless device context) of a wireless device atleast during a time period that a wireless device stays in a RANnotification area (RNA) of an anchor base station, and/or that awireless device stays in an RRC inactive state. In an example, an anchorbase station may be a base station that a wireless device in an RRCinactive state was lastly connected to in a latest RRC connected stateor that a wireless device lastly performed an RNA update procedure in.In an example, an RNA may comprise one or more cells operated by one ormore base stations. In an example, a base station may belong to one ormore RNAs. In an example, a cell may belong to one or more RNAs.

In an example, a wireless device may transition a UE RRC state from anRRC connected state to an RRC inactive state in a base station. Awireless device may receive RNA information from the base station. RNAinformation may comprise at least one of an RNA identifier, one or morecell identifiers of one or more cells of an RNA, a base stationidentifier, an IP address of the base station, an AS context identifierof the wireless device, a resume identifier, and/or the like.

In an example, an anchor base station may broadcast a message (e.g. RANpaging message) to base stations of an RNA to reach to a wireless devicein an RRC inactive state, and/or the base stations receiving the messagefrom the anchor base station may broadcast and/or multicast anothermessage (e.g. paging message) to wireless devices in their coveragearea, cell coverage area, and/or beam coverage area associated with theRNA through an air interface.

In an example, when a wireless device in an RRC inactive state movesinto a new RNA, the wireless device may perform an RNA update (RNAU)procedure, which may comprise a random access procedure by the wirelessdevice and/or a UE context retrieve procedure. A UE context retrieve maycomprise: receiving, by a base station from a wireless device, a randomaccess preamble; and fetching, by a base station, a UE context of thewireless device from an old anchor base station. Fetching may comprise:sending a retrieve UE context request message comprising a resumeidentifier to the old anchor base station and receiving a retrieve UEcontext response message comprising the UE context of the wirelessdevice from the old anchor base station.

In an example embodiment, a wireless device in an RRC inactive state mayselect a cell to camp on based on at least a on measurement results forone or more cells, a cell where a wireless device may monitor an RNApaging message and/or a core network paging message from a base station.In an example, a wireless device in an RRC inactive state may select acell to perform a random access procedure to resume an RRC connectionand/or to transmit one or more packets to a base station (e.g. to anetwork). In an example, if a cell selected belongs to a different RNAfrom an RNA for a wireless device in an RRC inactive state, the wirelessdevice may initiate a random access procedure to perform an RNA updateprocedure. In an example, if a wireless device in an RRC inactive statehas one or more packets, in a buffer, to transmit to a network, thewireless device may initiate a random access procedure to transmit oneor more packets to a base station of a cell that the wireless deviceselects. A random access procedure may be performed with two messages(e.g. 2 stage random access) and/or four messages (e.g. 4 stage randomaccess) between the wireless device and the base station.

In an example embodiment, a base station receiving one or more uplinkpackets from a wireless device in an RRC inactive state may fetch a UEcontext of a wireless device by transmitting a retrieve UE contextrequest message for the wireless device to an anchor base station of thewireless device based on at least one of an AS context identifier, anRNA identifier, a base station identifier, a resume identifier, and/or acell identifier received from the wireless device. In response tofetching a UE context, a base station may transmit a path switch requestfor a wireless device to a core network entity (e.g. AMF, MME, and/orthe like). A core network entity may update a downlink tunnel endpointidentifier for one or more bearers established for the wireless devicebetween a user plane core network entity (e.g. UPF, S-GW, and/or thelike) and a RAN node (e.g. the base station), e.g. changing a downlinktunnel endpoint identifier from an address of the anchor base station toan address of the base station.

A gNB may communicate with a wireless device via a wireless networkemploying one or more new radio technologies. The one or more radiotechnologies may comprise at least one of: multiple technologies relatedto physical layer; multiple technologies related to medium accesscontrol layer; and/or multiple technologies related to radio resourcecontrol layer. Example embodiments of enhancing the one or more radiotechnologies may improve performance of a wireless network. Exampleembodiments may increase the system throughput, or data rate oftransmission. Example embodiments may reduce battery consumption of awireless device. Example embodiments may improve latency of datatransmission between a gNB and a wireless device. Example embodimentsmay improve network coverage of a wireless network. Example embodimentsmay improve transmission efficiency of a wireless network.

In an example, a gNB may transmit a DCI via a PDCCH for at least one of:scheduling assignment/grant; slot format notification; pre-emptionindication; and/or power-control commends. More specifically, the DCImay comprise at least one of: identifier of a DCI format; downlinkscheduling assignment(s); uplink scheduling grant(s); slot formatindicator; pre-emption indication; power-control for PUCCH/PUSCH; and/orpower-control for SRS.

In an example, a downlink scheduling assignment DCI may compriseparameters indicating at least one of: identifier of a DCI format; PDSCHresource indication; transport format; HARQ information; controlinformation related to multiple antenna schemes; and/or a command forpower control of the PUCCH.

In an example, an uplink scheduling grant DCI may comprise parametersindicating at least one of: identifier of a DCI format; PUSCH resourceindication; transport format; HARQ related information; and/or a powercontrol command of the PUSCH.

In an example, different types of control information may correspond todifferent DCI message sizes. For example, supporting multiple beamsand/or spatial multiplexing in the spatial domain and noncontiguousallocation of RBs in the frequency domain may require a largerscheduling message, in comparison with an uplink grant allowing forfrequency-contiguous allocation. DCI may be categorized into differentDCI formats, where a format corresponds to a certain message size and/orusage.

In an example, a wireless device may monitor one or more PDCCH fordetecting one or more DCI with one or more DCI format, in common searchspace or wireless device-specific search space. In an example, awireless device may monitor PDCCH with a limited set of DCI format, tosave power consumption. The more DCI format to be detected, the morepower be consumed at the wireless device.

In an example, the information in the DCI formats for downlinkscheduling may comprise at least one of: identifier of a DCI format;carrier indicator; frequency domain resource assignment; time domainresource assignment; bandwidth part indicator; HARQ process number; oneor more MCS; one or more NDI; one or more RV; MIMO related information;Downlink assignment index (DAI); PUCCH resource indicator; PDSCH-to-HARQfeedback timing indicator; TPC for PUCCH; SRS request; and padding ifnecessary. In an example, the MIMO related information may comprise atleast one of: PMI; precoding information; transport block swap flag;power offset between PDSCH and reference signal; reference-signalscrambling sequence; number of layers; and/or antenna ports for thetransmission; and/or Transmission Configuration Indication (TCI).

In an example, the information in the DCI formats used for uplinkscheduling may comprise at least one of: an identifier of a DCI format;carrier indicator; bandwidth part indication; resource allocation type;frequency domain resource assignment; time domain resource assignment;MCS; NDI; Phase rotation of the uplink DMRS; precoding information; CSIrequest; SRS request; Uplink index/DAI; TPC for PUSCH; and/or padding ifnecessary.

In an example, a gNB may perform CRC scrambling for a DCI, beforetransmitting the DCI via a PDCCH. The gNB may perform CRC scrambling bybinary addition of multiple bits of at least one wireless deviceidentifier (e.g., C-RNTI, CS-RNTI, TPC-CS-RNTI, TPC-PUCCH-RNTI,TPC-PUSCH-RNTI, SP CSI C-RNTI, or TPC-SRS-RNTI) and the CRC bits of theDCI. The wireless device may check the CRC bits of the DCI, whendetecting the DCI. The wireless device may receive the DCI when the CRCis scrambled by a sequence of bits that is the same as the at least onewireless device identifier.

In an example, in order to support wide bandwidth operation, a gNB maytransmit one or more PDCCH in different control resource sets(coresets). A gNB may transmit one or more RRC message comprisingconfiguration parameters of one or more coresets. A coreset may compriseat least one of: a first OFDM symbol; a number of consecutive OFDMsymbols; a set of resource blocks; a CCE-to-REG mapping. In an example,a gNB may transmit a PDCCH in a dedicated coreset for particularpurpose, for example, for beam failure recovery confirmation.

In an example, a wireless device may monitor PDCCH for detecting DCI inone or more configured coresets, to reduce the power consumption.

A gNB may transmit one or more MAC PDU to a wireless device. In anexample, a MAC PDU may be a bit string that is byte aligned (e.g.,multiple of eight bits) in length. In an example, bit strings may berepresented by tables in which the most significant bit is the leftmostbit of the first line of the table, and the least significant bit is therightmost bit on the last line of the table, and more generally, the bitstring may be read from the left to right and then in the reading orderof the lines. In an example, the bit order of a parameter field within aMAC PDU is represented with the first and most significant bit in theleftmost bit and the last and least significant bit in the rightmostbit.

In an example, a MAC SDU may be a bit string that is byte aligned (e.g.,multiple of eight bits) in length. In an example, a MAC SDU may beincluded into a MAC PDU from the first bit onward.

In an example, a MAC CE may be a bit string that is byte aligned (e.g.,multiple of eight bits) in length.

In an example, a MAC subheader may be a bit string that is byte aligned(e.g., multiple of eight bits) in length. In an example, a MAC subheadermay be placed immediately in front of the corresponding MAC SDU, or MACCE, or padding.

In an example, a MAC entity may ignore a value of reserved bits in a DLMAC PDU.

In an example, a MAC PDU may comprise one or more MAC subPDUs. a MACsubPDU of the one or more MAC subPDUs may comprise at least one of: aMAC subheader only (including padding); a MAC subheader and a MAC SDU; aMAC subheader and a MAC CE; and/or a MAC subheader and padding. In anexample, the MAC SDU may be of variable size. In an example, a MACsubheader may correspond to a MAC SDU, or a MAC CE, or padding.

In an example, a MAC subheader may comprise: an R field with one bit; aF field with one bit in length; a LCID field with multiple bits inlength; a L field with multiple bits in length, when the MAC subheadercorresponds to a MAC SDU, or a variable-sized MAC CE, or padding.

In an example, a MAC subheader may comprise an eight-bit L field. In theexample, the LCID field may have six bits in length, and the L field mayhave eight bits in length. In an example, a MAC subheader may comprise asixteen-bit L field. In the example, the LCID field may have six bits inlength, and the L field may have sixteen bits in length.

In an example, a MAC subheader may comprise: a R field with two bits inlength; and a LCID field with multiple bits in length, when the MACsubheader corresponds to a fixed sized MAC CE, or padding. In anexample, the LCID field may have six bits in length, and the R field mayhave two bits in length.

In an example DL MAC PDU, multiple MAC CEs may be placed together. A MACsubPDU comprising MAC CE may be placed before any MAC subPDU comprisinga MAC SDU, or a MAC subPDU comprising padding.

In an example UL MAC PDU, multiple MAC CEs may be placed together. A MACsubPDU comprising MAC CE may be placed after all MAC subPDU comprising aMAC SDU. The MAC subPDU may be placed before a MAC subPDU comprisingpadding.

In an example, a MAC entity of a gNB may transmit to a MAC entity of awireless device one or more MAC CEs. In an example, multiple LCIDs maybe associated with the one or more MAC CEs. In the example, the one ormore MAC CEs may comprise at least one of: a SP ZP CSI-RS Resource SetActivation/Deactivation MAC CE; a PUCCH spatial relationActivation/Deactivation MAC CE; a SP SRS Activation/Deactivation MAC CE;a SP CSI reporting on PUCCH Activation/Deactivation MAC CE; a TCI StateIndication for UE-specific PDCCH MAC CE; a TCI State Indication forUE-specific PDSCH MAC CE; an Aperiodic CSI Trigger State SubselectionMAC CE; a SP CSI-RS/CSI-IM Resource Set Activation/Deactivation MAC CE;a UE contention resolution identity MAC CE; a timing advance command MACCE; a DRX command MAC CE; a Long DRX command MAC CE; a SCellactivation/deactivation MAC CE (1 Octet); a SCellactivation/deactivation MAC CE (4 Octet); and/or a duplicationactivation/deactivation MAC CE. In an example, a MAC CE may have a LCIDin the corresponding MAC subheader. Different MAC CE may have differentLCID in the corresponding MAC subheader. For example, the LCID with111011 in a MAC subheader may indicate a MAC CE associated with the MACsubheader is a long DRX command MAC CE.

In an example, the MAC entity of the wireless device may transmit to theMAC entity of the gNB one or more MAC CEs. In an example, the one ormore MAC CEs may comprise at least one of: a short buffer status report(BSR) MAC CE; a long BSR MAC CE; a C-RNTI MAC CE; a configured grantconfirmation MAC CE; a single entry PHR MAC CE; a multiple entry PHR MACCE; a short truncated BSR; and/or a long truncated BSR. In an example, aMAC CE may have a LCID in the corresponding MAC subheader. Different MACCE may have different LCID in the corresponding MAC subheader. Forexample, the LCID with 111011 in a MAC subheader may indicate a MAC CEassociated with the MAC subheader is a short-truncated command MAC CE.

In a carrier aggregation (CA), two or more component carriers (CCs) maybe aggregated. A wireless device may simultaneously receive or transmiton one or more CCs depending on capabilities of the wireless device. Inan example, the CA may be supported for contiguous CCs. In an example,the CA may be supported for non-contiguous CCs.

When configured with a CA, a wireless device may have one RRC connectionwith a network. During an RRC connectionestablishment/re-establishment/handover, a cell providing a NAS mobilityinformation may be a serving cell. During an RRC connectionre-establishment/handover procedure, a cell providing a security inputmay be a serving cell. In an example, the serving cell may be referredto as a primary cell (PCell). In an example, a gNB may transmit, to awireless device, one or more messages comprising configurationparameters of a plurality of one or more secondary cells (SCells),depending on capabilities of the wireless device.

When configured with CA, a base station and/or a wireless device mayemploy an activation/deactivation mechanism of an SCell for an efficientbattery consumption. When a wireless device is configured with one ormore SCells, a gNB may activate or deactivate at least one of the one ormore SCells. Upon configuration of an SCell, the SCell may bedeactivated.

In an example, a wireless device may activate/deactivate an SCell inresponse to receiving an SCell Activation/Deactivation MAC CE.

In an example, a base station may transmit, to a wireless device, one ormore messages comprising an sCellDeactivationTimer timer. In an example,a wireless device may deactivate an SCell in response to an expiry ofthe sCellDeactivationTimer timer.

When a wireless device receives an SCell Activation/Deactivation MAC CEactivating an SCell, the wireless device may activate the SCell. Inresponse to the activating the SCell, the wireless device may performoperations comprising SRS transmissions on the SCell, CQI/PMI/RI/CRIreporting for the SCell on a PCell, PDCCH monitoring on the SCell, PDCCHmonitoring for the SCell on the PCell, and/or PUCCH transmissions on theSCell.

In an example, in response to the activating the SCell, the wirelessdevice may start or restart an sCellDeactivationTimer timer associatedwith the SCell. The wireless device may start the sCellDeactivationTimertimer in the slot when the SCell Activation/Deactivation MAC CE has beenreceived. In an example, in response to the activating the SCell, thewireless device may (re-)initialize one or more suspended configureduplink grants of a configured grant Type 1 associated with the SCellaccording to a stored configuration. In an example, in response to theactivating the SCell, the wireless device may trigger PHR.

In an example, when a wireless device receives an SCellActivation/Deactivation MAC CE deactivating an activated SCell, thewireless device may deactivate the activated SCell.

In an example, when an sCellDeactivationTimer timer associated with anactivated SCell expires, the wireless device may deactivate theactivated SCell. In response to the deactivating the activated SCell,the wireless device may stop the sCellDeactivationTimer timer associatedwith the activated SCell. In an example, in response to the deactivatingthe activated SCell, the wireless device may clear one or moreconfigured downlink assignments and/or one or more configured uplinkgrant Type 2 associated with the activated SCell. In an example, inresponse to the deactivating the activated SCell, the wireless devicemay further suspend one or more configured uplink grant Type 1associated with the activated SCell. The wireless device may flush HARQbuffers associated with the activated SCell.

In an example, when an SCell is deactivated, a wireless device may notperform operations comprising transmitting SRS on the SCell, reportingCQI/PMI/RI/CRI for the SCell on a PCell, transmitting on UL-SCH on theSCell, transmitting on RACH on the SCell, monitoring at least one firstPDCCH on the SCell, monitoring at least one second PDCCH for the SCellon the PCell, transmitting a PUCCH on the SCell.

In an example, when at least one first PDCCH on an activated SCellindicates an uplink grant or a downlink assignment, a wireless devicemay restart an sCellDeactivationTimer timer associated with theactivated SCell. In an example, when at least one second PDCCH on aserving cell (e.g. a PCell or an SCell configured with PUCCH, i.e. PUCCHSCell) scheduling the activated SCell indicates an uplink grant or adownlink assignment for the activated SCell, a wireless device mayrestart an sCellDeactivationTimer timer associated with the activatedSCell.

In an example, when an SCell is deactivated, if there is an ongoingrandom access procedure on the SCell, a wireless device may abort theongoing random access procedure on the SCell.

An example SCell Activation/Deactivation MAC CE may comprise one octet.A first MAC PDU subheader with a first LCID may identify the SCellActivation/Deactivation MAC CE of one octet. The SCellActivation/Deactivation MAC CE of one octet may have a fixed size. TheSCell Activation/Deactivation MAC CE of one octet may comprise a singleoctet. The single octet may comprise a first number of C-fields (e.g.seven) and a second number of R-fields (e.g. one).

An example SCell Activation/Deactivation MAC CE may comprise fouroctets. A second MAC PDU subheader with a second LCID may identify theSCell Activation/Deactivation MAC CE of four octets. The SCellActivation/Deactivation MAC CE of four octets may have a fixed size. TheSCell Activation/Deactivation MAC CE of four octets may comprise fouroctets. The four octets may comprise a third number of C-fields (e.g.31) and a fourth number of R-fields (e.g. 1).

In an example, a C_(i) field may indicate an activation/deactivationstatus of an SCell with an SCell index i, if a SCell with SCell index iis configured. In an example, when the C_(i), field is set to one, anSCell with an SCell index i may be activated. In an example, when theC_(i) field is set to zero, an SCell with an SCell index i may bedeactivated. In an example, if there is no SCell configured with SCellindex i, the wireless device may ignore the C_(i) field. In an example,an R field may indicate a reserved bit. The R field may be set to zero.

A base station (gNB) may configure a wireless device (UE) with uplink(UL) bandwidth parts (BWPs) and downlink (DL) BWPs to enable bandwidthadaptation (BA) on a PCell. If carrier aggregation is configured, thegNB may configure the UE with at least DL BWP(s) (i.e. there may be noUL BWPS in the UL) to enable BA on an SCell. For the PCell, a firstinitial BWP may be a first BWP used for initial access. For the SCell, asecond initial BWP is a second BWP configured for the UE to firstoperate at the SCell when the SCell is activated.

In paired spectrum (e.g. FDD), a first DL and a first UL can switch BWPindependently. In unpaired spectrum (e.g. TDD), a second DL and a secondUL switch BWP simultaneously. Switching between configured BWPs mayhappen by means of a DCI or an inactivity timer. When the inactivitytimer is configured for a serving cell, an expiry of the inactivitytimer associated to that cell may switch an active BWP to a default BWP.The default BWP may be configured by the network.

In an example, for FDD systems, when configured with BA, one UL BWP foreach uplink carrier and one DL BWP may be active at a time in an activeserving cell. In an example, for TDD systems, one DL/UL BWP pair may beactive at a time in an active serving cell. Operating on the one UL BWPand the one DL BWP (or the one DL/UL pair) may enable reasonable UEbattery consumption. BWPs other than the one UL BWP and the one DL BWPthat the UE may be configured with may be deactivated. On deactivatedBWPs, the UE may not monitor PDCCH, may not transmit on PUCCH, PRACH andUL-SCH.

In an example, a Serving Cell may be configured with at most a firstnumber (e.g., four) BWPs. In an example, for an activated Serving Cell,there may be one active BWP at any point in time.

In an example, a BWP switching for a Serving Cell may be used toactivate an inactive BWP and deactivate an active BWP at a time. In anexample, the BWP switching may be controlled by a PDCCH indicating adownlink assignment or an uplink grant. In an example, the BWP switchingmay be controlled by an inactivity timer (e.g.bandwidthpartInactivityTimer). In an example, the BWP switching may becontrolled by a MAC entity in response to initiating a Random Accessprocedure. Upon addition of SpCell or activation of an SCell, one BWPmay be initially active without receiving a PDCCH indicating a downlinkassignment or an uplink grant. The active BWP for a Serving Cell may beindicated by RRC and/or PDCCH. In an example, for unpaired spectrum, aDL BWP may be paired with a UL BWP, and BWP switching may be common forboth UL and DL.

In an example, a MAC entity may apply normal operations on an active BWPfor an activated Serving Cell configured with a BWP including:transmitting on UL-SCH; transmitting on RACH; monitoring a PDCCH;transmitting PUCCH; receiving DL-SCH; (re-) initializing any suspendedconfigured uplink grants of configured grant Type 1 according to astored configuration, if any, and to start in a symbol based on someprocedure.

In an example, on an inactive BWP for each activated Serving Cellconfigured with a BWP, a MAC entity may not transmit on UL-SCH; may nottransmit on RACH; may not monitor a PDCCH; may not transmit PUCCH; maynot transmit SRS, may not receive DL-SCH; may clear any configureddownlink assignment and configured uplink grant of configured grant Type2; may suspend any configured uplink grant of configured Type 1.

In an example, upon initiation of a Random Access procedure, if PRACHresources are configured for an active UL BWP, a MAC entity may performthe Random Access procedure on an active DL BWP and the active UL BWP.In an example, upon initiation of a Random Access procedure, if PRACHresources are not configured for an active UL BWP, a MAC entity mayswitch to an initial DL BWP and an initial UL BWP. In response to theswitching, the MAC entity may perform the Random Access procedure on theinitial DL BWP and the initial UL BWP.

In an example, if a MAC entity receives a PDCCH for a BWP switching of aserving cell while a Random Access procedure associated with thisserving cell is not ongoing, a UE may perform the BWP switching to a BWPindicated by the PDCCH.

In an example, if a MAC entity receives a PDCCH for a BWP switchingwhile a Random Access procedure is ongoing in the MAC entity, it may beup to UE implementation whether to switch BWP or ignore the PDCCH forthe BWP switching. In an example, if the MAC entity decides to performthe BWP switching, the MAC entity may stop the ongoing Random Accessprocedure and initiate a second Random Access procedure on a newactivated BWP. In an example, if the MAC decides to ignore the PDCCH forthe BWP switching, the MAC entity may continue with the ongoing RandomAccess procedure on the active BWP.

In an example, if a MAC entity receives a PDCCH for a BWP switchingaddressed to a C-RNTI for a successful completion of a Random Accessprocedure, a UE may perform the BWP switching to a BWP indicated by thePDCCH.

In an example, if a BWP-InactivityTimer is configured, for an activatedServing Cell, if a Default-DL-BWP is configured, and an active DL BWP isnot a BWP indicated by the Default-DL-BWP; or if the Default-DL-BWP isnot configured, and the active DL BWP is not the initial BWP: if a PDCCHaddressed to C-RNTI or CS-RNTI indicating downlink assignment or uplinkgrant is received on the active BWP: if there is not an ongoing randomaccess procedure associated with the activated Serving Cell, the MACentity may start or restart the BWP-InactivityTimer associated with theactive DL BWP.

In an example, if a BWP-InactivityTimer is configured, for an activatedServing Cell, if a Default-DL-BWP is configured, and an active DL BWP isnot a BWP indicated by the Default-DL-BWP; or if the Default-DL-BWP isnot configured, and the active DL BWP is not the initial BWP: if aMAC-PDU is transmitted in a configured uplink grant or received in aconfigured downlink assignment; if there is not an ongoing random accessprocedure associated with the activated Serving Cell, the MAC entity maystart or restart the BWP-InactivityTimer associated with the active DLBWP.

In an example, if a BWP-InactivityTimer is configured, for an activatedServing Cell, if a Default-DL-BWP is configured, and an active DL BWP isnot a BWP indicated by the Default-DL-BWP; or if the Default-DL-BWP isnot configured, and the active DL BWP is not the initial BWP: if a PDCCHaddressed to C-RNTI or CS-RNTI indicating downlink assignment or uplinkgrant is received on the active BWP; or if a MAC-PDU is transmitted in aconfigured uplink grant or received in a configured downlink assignment:if an ongoing random access procedure associated with the activatedServing Cell is successfully completed in response to receiving thePDCCH addressed to a C-RNTI, the MAC entity may start or restart theBWP-InactivityTimer associated with the active DL BWP.

In an example, if a BWP-InactivityTimer is configured, for an activatedServing Cell, if a Default-DL-BWP is configured, and an active DL BWP isnot a BWP indicated by the Default-DL-BWP; or if the Default-DL-BWP isnot configured, and the active DL BWP is not the initial BWP: if a PDCCHfor a BWP switching is received on the active DL BWP, a MAC entity maystart or restart the BWP-InactivityTimer associated with the active DLBWP in response to switching the active BWP.

In an example, if BWP-InactivityTimer is configured, for an activatedServing Cell, if the Default-DL-BWP is configured, and the active DL BWPis not the BWP indicated by the Default-DL-BWP; or if the Default-DL-BWPis not configured, and the active DL BWP is not the initial BWP: ifRandom Access procedure is initiated, the MAC entity may stop theBWP-InactivityTimer associated with the active DL BWP of the activatedServing Cell. If the activated Serving Cell is an SCell (other than aPSCell), the MAC entity may stop a second BWP-InactivityTimer associatedwith a second active DL BWP of an SpCell.

In an example, if BWP-InactivityTimer is configured, for an activatedServing Cell, if the Default-DL-BWP is configured, and the active DL BWPis not the BWP indicated by the Default-DL-BWP; or if the Default-DL-BWPis not configured, and the active DL BWP is not the initial BWP: ifBWP-InactivityTimer associated with the active DL BWP expires: if theDefault-DL-BWP is configured, the MAC entity may perform BWP switchingto a BWP indicated by the Default-DL-BWP. Otherwise, the MAC entity mayperform BWP switching to the initial DL BWP.

In an example, a UE may be configured for operation in bandwidth parts(BWPs) of a serving cell. In an example, the UE may be configured byhigher layers for the serving cell a set of (e.g., at most four)bandwidth parts (BWPs) for receptions by the UE (e.g., DL BWP set) in aDL bandwidth by parameter DL-BWP. In an example, the UE may beconfigured with a set of (e.g., at most four) BWPs for transmissions bythe UE (e.g., UL BWP set) in an UL bandwidth by parameter UL-BWP for theserving cell.

In an example, an initial active DL BWP may be defined, for example, bya location and number of contiguous PRBs, a subcarrier spacing, and acyclic prefix, for the control resource set for Type0-PDCCH commonsearch space. In an example, for operation on a primary cell, a UE maybe provided by higher layer with a parameter initial-UL-BWP, an initialactive UL BWP for a random access procedure.

In an example, if a UE has a dedicated BWP configuration, the UE may beprovided by higher layer parameter Active-BWP-DL-Pcell a first active DLBWP for receptions. If a UE has a dedicated BWP configuration, the UEmay be provided by higher layer parameter Active-BWP-UL-Pcell a firstactive UL BWP for transmissions on a primary cell.

In an example, for a DL BWP or an UL BWP in a set of DL BWPs or UL BWPs,respectively, the UE may be configured with the following parameters forthe serving cell: a subcarrier spacing provided by higher layerparameter DL-BWP-mu or UL-BWP-mu; a cyclic prefix provided by higherlayer parameter DL-BWP-CP or UL-BWP-CP; a PRB offset with respect to thePRB determined by higher layer parameters offset-pointA-low-scs andref-scs and a number of contiguous PRBs provided by higher layerparameter DL-BWP-BW or UL-BWP-BW; an index in the set of DL BWPs or ULBWPs by respective higher layer parameters DL-BWP-index or UL-BWP-index;a DCI format 1_0 or DCI format 1_1 detection to a PDSCH reception timingvalues by higher layer parameter DL-data-time-domain; a PDSCH receptionto a HARQ-ACK transmission timing values by higher layer parameterDL-data-DL-acknowledgement; and a DCI 0_0 or DCI 0_1 detection to aPUSCH transmission timing values by higher layer parameterUL-data-time-domain;

In an example, for an unpaired spectrum operation, a DL BWP from a setof configured DL BWPs with index provided by higher layer parameterDL-BWP-index may be paired with an UL BWP from a set of configured ULBWPs with index provided by higher layer parameter UL-BWP-index when theDL BWP index and the UL BWP index are equal. For unpaired spectrumoperation, a UE may not be expected to receive a configuration where thecenter frequency for a DL BWP is different than the center frequency foran UL BWP when the DL-BWP-index of the DL BWP is equal to theUL-BWP-index of the UL BWP.

In an example, for a DL BWP in a set of DL BWPs on the primary cell, aUE may be configured control resource sets for every type of commonsearch space and for UE-specific search space. In an example, the UE maynot be expected to be configured without a common search space on thePCell, or on the PSCell, in the active DL BWP. In an example, for an ULBWP in a set of UL BWPs, the UE may be configured resource sets forPUCCH transmissions. In an example, a UE may receive PDCCH and PDSCH ina DL BWP according to a configured subcarrier spacing and CP length forthe DL BWP. A UE may transmit PUCCH and PUSCH in an UL BWP according toa configured subcarrier spacing and CP length for the UL BWP.

In an example, if a bandwidth part indicator field is configured in DCIformat 1_1, the bandwidth part indicator field value may indicate theactive DL BWP, from the configured DL BWP set, for DL receptions. In anexample, if a bandwidth part indicator field is configured in DCI format0_1, the bandwidth part indicator field value may indicate the active ULBWP, from the configured UL BWP set, for UL transmissions. In anexample, for the primary cell, a UE may be provided by higher layerparameter Default-DL-BWP, a default DL BWP among the configured DL BWPs.In an example, if a UE is not provided a default DL BWP by higher layerparameter Default-DL-BWP, the default BWP may be the initial active DLBWP.

In an example, a UE may be expected to detect a DCI format 0_1indicating active UL BWP change, or a DCI format 1_1 indicating activeDL BWP change, only if a corresponding PDCCH is received within first 3symbols of a slot.

In an example, for a primary cell, a UE may be provided by a higherlayer parameter Default-DL-BWP a default DL BWP among the configured DLBWPs. If a UE is not provided a default DL BWP by the higher layerparameter Default-DL-BWP, the default DL BWP is the initial active DLBWP.

In an example, a UE may be provided by higher layer parameterBWP-InactivityTimer, a timer value for the primary cell. If configured,the UE may increment the timer, if running, every interval of 1millisecond for frequency range 1 or every 0.5 milliseconds forfrequency range 2 if the UE may not detect a DCI format 1_1 for pairedspectrum operation or if the UE may not detect a DCI format 1_1 or DCIformat 0_1 for unpaired spectrum operation during the interval.

In an example, if a UE is configured for a secondary cell with higherlayer parameter Default-DL-BWP indicating a default DL BWP among theconfigured DL BWPs and the UE is configured with higher layer parameterBWP-InactivityTimer indicating a timer value, the UE procedures on thesecondary cell may be same as on the primary cell using the timer valuefor the secondary cell and the default DL BWP for the secondary cell.

In an example, if a UE is configured by higher layer parameterActive-BWP-DL-SCell a first active DL BWP and by higher layer parameterActive-BWP-UL-SCell a first active UL BWP on a secondary cell orcarrier, the UE may use the indicated DL BWP and the indicated UL BWP onthe secondary cell as the respective first active DL BWP and firstactive UL BWP on the secondary cell or carrier.

In an example, a base station may transmit, to a wireless device, one ormore messages indicating random access parameters. For example, the oneor more messages may be broadcast RRC message, wireless device specificRRC message, and/or combination thereof. For example, the one or moremessage may comprise at least one of RACH-ConfigCommon,RACH-ConfigGeneric, and RACH-ConfigDedicated. For example, for acontention based random access procedure, a wireless device may receive,from a base station, at least RACH-ConfigCommon and RACH-ConfigGeneric.For example, for a contention free random access procedure, a wirelessdevice may receive, from a base station, at least RACH-ConfigDedicated.

FIG. 16 shows an example RACH-ConfigCommon, and FIG. 17 shows an examplefield description of RACH-ConfigCommon. FIG. 18 shows an exampleRACH-ConfigGeneric, and an example field description ofRACH-ConfigGeneric. FIG. 19 shows an example RACH-ConfigDedicated, andFIG. 20 shows an example field description of RACH-ConfigDedicated.

For example, a random access procedure may be initiated in differentways based at least on one of RACH-ConfigCommon, RACH-ConfigGeneric, andRACH-ConfigDedicated. For example, the random access procedure may beinitiated by a PDCCH order transmitted by a base station, by the MACentity of a wireless device, or by RRC. There may be one random accessprocedure ongoing at any point in time in a MAC entity. The randomaccess procedure on an SCell may be initiated by a PDCCH order withra-PreambleIndex different from Ob000000. For example, if the MAC entityof a wireless device receives a request for a random access procedurewhile another is already ongoing in the MAC entity, a wireless devicemay continue with the ongoing procedure or start with the new procedure(e.g. for SI request).

In an example, a base station may transmit one or more RRC message toconfigure a wireless device at least one of following parameters:prach-ConfigIndex: the available set of PRACH occasions for thetransmission of the Random Access Preamble; preambleReceivedTargetPower:initial Random Access Preamble power; rsrp-ThresholdSSB: an RSRPthreshold for the selection of the SSB and corresponding Random AccessPreamble and/or PRACH occasion (If the Random Access procedure isinitiated for beam failure recovery, rsrp-ThresholdSSB refers torsrp-ThresholdSSB in BeamFailureRecoveryConfig IE);rsrp-ThresholdCSI-RS: an RSRP threshold for the selection of CSI-RS andcorresponding Random Access Preamble and/or PRACH occasion (If theRandom Access procedure is initiated for beam failure recovery,rsrp-ThresholdCSI-RS shall be set to a value calculated by multiplyingrsrp-ThresholdSSB in BeamFailureRecoveryConfig IE bypowerControlOffset); rsrp-ThresholdSSB-SUL: an RSRP threshold for theselection between the NUL carrier and the SUL carrier;powerControlOffset: a power offset between rsrp-ThresholdSSB andrsrp-ThresholdCSI-RS to be used when the Random Access procedure isinitiated for beam failure recovery; powerRampingStep: the power-rampingfactor; powerRampingStepHighPriority: the power-ramping factor in caseof differentiated Random Access procedure; ra-PreambleIndex: RandomAccess Preamble; ra-ssb-OccasionMaskIndex: defines PRACH occasion(s)associated with an SSB in which the MAC entity may transmit a RandomAccess Preamble (FIG. 21 shows an example of ra-ssb-OccasionMaskIndexvalues); ra-OccasionList: defines PRACH occasion(s) associated with aCSI-RS in which the MAC entity may transmit a Random Access Preamble;preambleTransMax: the maximum number of Random Access Preambletransmission; ssb-perRACH-OccasionAndCB-PreamblesPerSSB: defines thenumber of SSBs mapped to each PRACH occasion and the number of RandomAccess Preambles mapped to each SSB; the set of Random Access Preamblesand/or PRACH occasions for SI request, if any; the set of Random AccessPreambles and/or PRACH occasions for beam failure recovery request, ifany; ra-ResponseWindow: the time window to monitor RA response(s);ra-ContentionResolutionTimer: the Contention Resolution Timer.

In an example, a random access procedure may be initiated for beamfailure detection and recovery. For example, a wireless device may beconfigured by RRC with a beam failure recovery procedure which may beused for indicating to the serving base station of an SSB or CSI-RS whenbeam failure is detected on the serving SSB(s)/CSI-RS(s). Beam failuremay be detected by counting beam failure instance indication from thelower layers to the MAC entity. For example, a base station mayconfigure, via RRC, the following parameters in theBeamFailureRecoveryConfig for the Beam Failure Detection and Recoveryprocedure: beamFailurelnstanceMaxCount for the beam failure detection;beamFailureDetectionTimer for the beam failure detection;beamFailureRecoveryTimer for the beam failure recovery procedure;rsrp-ThresholdSSB: an RSRP threshold for the beam failure recovery;powerRampingStep: powerRampingStep for the beam failure recovery;preambleReceivedTargetPower: preambleReceivedTargetPower for the beamfailure recovery; preambleTransMax: preambleTransMax for the beamfailure recovery; ra-ResponseWindow: the time window to monitorresponse(s) for the beam failure recovery using contention-free RandomAccess Preamble; prach-ConfigIndex: prach-ConfigIndex for the beamfailure recovery; ra-ssb-OccasionMaskIndex: ra-ssb-OccasionMaskIndex forthe beam failure recovery; ra-OccasionList: ra-OccasionList for the beamfailure recovery.

In an example, a wireless device may employ one or more parameters for arandom access procedure. For example, a wireless device may employ atleast one of PREAMBLE_INDEX; PREAMBLE_TRANSMISSION_COUNTER;PREAMBLE_POWER_RAMPING_COUNTER; PREAMBLE_POWER_RAMPING_STEP;PREAMBLE_RECEIVED_TARGET_POWER; PREAMBLE_BACKOFF; PCMAX;SCALING_FACTOR_BI; and TEMPORARY_C-RNTI.

In an example, a wireless device may perform random access resourceselection for selecting one or more preambles and one or more PRACHoccasion (or resources comprising time, frequency, and/or code). Forexample, there may be one or more cases that a random access proceduremay be initiated for beam failure recovery; and/or thebeamFailureRecoveryTimer is either running or not configured; and/or thecontention-free Random Access Resources for beam failure recoveryrequest associated with any of the SSBs and/or CSI-RSs have beenexplicitly provided by RRC; and/or at least one of the SSBs with SS-RSRPabove rsrp-ThresholdSSB amongst the SSBs in candidateBeamRSList or theCSI-RS s with CSI-RSRP above rsrp-ThresholdCSI-RS amongst the CSI-RSs incandidateBeamRSList is available. In this case, a wireless device mayselect an SSB with SS-RSRP above rsrp-ThresholdSSB amongst the SSBs incandidateBeamRSList or a CSI-RS with CSI-RSRP above rsrp-ThresholdCSI-RSamongst the CSI-RSs in candidateBeamRSList. For example, if CSI-RS isselected, and there is no ra-PreambleIndex associated with the selectedCSI-RS, a wireless device may set the PREAMBLE_INDEX to ara-PreambleIndex corresponding to the SSB in candidateBeamRSList whichis quasi-collocated with the selected CSI-RS, otherwise the wirelessdevice may set the PREAMBLE_INDEX to a ra-PreambleIndex corresponding tothe selected SSB or CSI-RS from the set of Random Access Preambles forbeam failure recovery request.

For example, there may be one or more cases that a random accessprocedure may be initiated and/or a ra-PreambleIndex has been explicitlyprovided by either PDCCH or RRC; and/or the ra-PreambleIndex is notOb000000; and/or contention-free Random Access Resource associated withSSBs or CSI-RSs have not been explicitly provided by RRC. In this case,a wireless device may set the PREAMBLE_INDEX to the signaledra-PreambleIndex.

For example, there may be one or more cases that a random accessprocedure may be initiated and/or the contention-free Random AccessResources associated with SSBs have been explicitly provided by RRC andat least one SSB with SS-RSRP above rsrp-ThresholdSSB amongst theassociated SSBs is available. In this case, a wireless device may selectan SSB with SS-RSRP above rsrp-ThresholdSSB amongst the associated SSBs.For example, the wireless device may set the PREAMBLE_INDEX to ara-PreambleIndex corresponding to the selected SSB.

For example, there may be one or more cases that a random accessprocedure may be initiated and the contention-free Random AccessResources associated with CSI-RSs have been explicitly provided by RRCand at least one CSI-RS with CSI-RSRP above rsrp-ThresholdCSI-RS amongstthe associated CSI-RSs is available. In this case, a wireless device mayselect a CSI-RS with CSI-RSRP above rsrp-ThresholdCSI-RS amongst theassociated CSI-RSs. for example, the wireless device may set thePREAMBLE_INDEX to a ra-PreambleIndex corresponding to the selectedCSI-RS.

For example, there may be one or more cases that a random accessprocedure may be initiated and at least one of the SSBs with SS-RSRPabove rsrp-ThresholdSSB is available. In this case, for example, awireless device may select an SSB with SS-RSRP above rsrp-ThresholdSSB,otherwise may select any SSB. For example, a random access resourceselection is performed when Msg3 is being retransmitted, a wirelessdevice may select the same group of Random Access Preambles as was usedfor the Random Access Preamble transmission attempt corresponding to thefirst transmission of Msg3. For example, if the association betweenRandom Access Preambles and SSBs is configured, a wireless device mayselect a ra-PreambleIndex randomly with equal probability from theRandom Access Preambles associated with the selected SSB and theselected Random Access Preambles group. For example, if the associationbetween Random Access Preambles and SSBs is not configured, a wirelessdevice may select a ra-PreambleIndex randomly with equal probabilityfrom the Random Access Preambles within the selected Random AccessPreambles group. For example, a wireless device may set thePREAMBLE_INDEX to the selected ra-PreambleIndex.

In an example, if an SSB is selected above and an association betweenPRACH occasions and SSBs is configured, a wireless device may determinethe next available PRACH occasion from the PRACH occasions correspondingto the selected SSB permitted by the restrictions given by thera-ssb-OccasionMaskIndex if configured (the MAC entity of the wirelessdevice may select a PRACH occasion randomly with equal probabilityamongst the PRACH occasions occurring simultaneously but on differentsubcarriers, corresponding to the selected SSB; the MAC entity may takeinto account the possible occurrence of measurement gaps whendetermining the next available PRACH occasion corresponding to theselected SSB).

In an example, if a CSI-RS is selected above and an association betweenPRACH occasions and CSI-RSs is configured. a wireless device maydetermine the next available PRACH occasion from the PRACH occasions inra-OccasionList corresponding to the selected CSI-RS (the MAC entityshall select a PRACH occasion randomly with equal probability amongstthe PRACH occasions occurring simultaneously but on differentsubcarriers, corresponding to the selected CSI-RS; the MAC entity maytake into account the possible occurrence of measurement gaps whendetermining the next available PRACH occasion corresponding to theselected CSI-RS).

In an example, if a CSI-RS is selected above and there is nocontention-free Random Access Resource associated with the selectedCSI-RS, a wireless device may determine the next available PRACHoccasion from the PRACH occasions, permitted by the restrictions givenby the ra-ssb-OccasionMaskIndex if configured, corresponding to the SSBin candidateBeamRSList which is quasi-collocated with the selectedCSI-RS (the MAC entity may take into account the possible occurrence ofmeasurement gaps when determining the next available PRACH occasioncorresponding to the SSB which is quasi-colocated with the selectedCSI-RS).

For example, a wireless device may determine the next available PRACHoccasion (the MAC entity shall select a PRACH occasion randomly withequal probability amongst the PRACH occasions occurring simultaneouslybut on different subcarriers; the MAC entity may take into account thepossible occurrence of measurement gaps when determining the nextavailable PRACH occasion).

For example, based on a selected PREAMBLE INDEX and PRACH occasion, awireless device may perform the random access preamble transmission. Forexample, if the notification of suspending power ramping counter has notbeen received from lower layers; and/or if SSB selected is not changed(i.e. same as the previous Random Access Preamble transmission), awireless device may increment PREAMBLE_POWER_RAMPING_COUNTER by 1. thewireless device may select a value of DELTA_PREAMBLE that may bepredefined and/or semi-statistically configured by a base station andset PREAMBLE_RECEIVED_TARGET_POWER topreambleReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_POWER_RAMPING_COUNTER−1)×PREAMBLE_POWER_RAMPING_STEP.The wireless device may instruct the physical layer to transmit theRandom Access Preamble using the selected PRACH, corresponding RA-RNTI(if available), PREAMBLE_INDEX and PREAMBLE_RECEIVED_TARGET_POWER. Forexample, the wireless device may compute an RA-RNTI associated with thePRACH occasion in which the Random Access Preamble is transmitted, e.g.,The RA-RNTI associated with the PRACH in which the Random AccessPreamble is transmitted, may be computed as:

RA-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id

where s_id is the index of the first OFDM symbol of the specified PRACH(0≤s_id<14), t_id is the index of the first slot of the specified PRACHin a system frame (0≤t_id<80), f_id is the index of the specified PRACHin the frequency domain (0≤f_id<8), and ul_carrier_id is the UL carrierused for Msg1 transmission (0 for NUL carrier, and 1 for SUL carrier).

FIG. 22 shows an example of BWP switching on a PCell. FIG. 23 shows anexample of BWP switching on a SCell.

In an example, a gNB may transmit to, or receive from, a wireless deviceone or more data packets, via one or more radio resources. The one ormore date packets may be one or more URLLC (Ultra-Reliable Low LatencyCommunication) data packets with small packet size (e.g., <100 bytes),which may require ultra-reliable (e.g., BLER less than 10{circumflexover ( )}⁽⁻⁵⁾) and low latency delivery (e.g., less than 1 millisecond)between the gNB and the wireless device. In an example, the one or moredata packets may be one or more eMBB (enhanced Mobile Broadband) datapackets with big packet size (e.g., >1000 bytes), which may requirelarge bandwidth (e.g., 400 MHz˜1 GHz) and/or big amount of radioresources. In an example, the one or more date packets may be one ormore machine type communication (e.g., MTC) data packets with smallpacket size which require wide coverage (e.g., 10 KM˜100 KM, ortransmitting a wireless device located in a basement). In an example,existing BWP and CA operation mechanisms may support at most one activeBWP in a cell. When necessary to transmit multiple services on multipleactive BWPs, the existing BWP and CA operation mechanisms may be notefficient and/or have large transmission latency. In an example,activation/deactivation of an SCell based on MAC CE, for adding anadditional active BWP, may take long time (e.g., several tens ofmilliseconds). In an example, transmission of some type of service onthe additional active BWP of the SCell may not be tolerant of a delay ofthe activation/deactivation.

In an example, when configured with multiple BWPs for a cell, a gNB anda UE may communicate on multiple active BWPs of the multiple BWPs inparallel (e.g., simultaneously or overlapped in time) to accommodatemultiple services (e.g., eMBB, URLLC, or MTC). In an example, on a firstactive BWP, a gNB may transmit an eMBB data packet to a UE. In anexample, on a second active BWP, the gNB may transmit an URLLC datapacket to the UE. In an example, on a third active BWP, the gNB maytransmit an MTC data packet to the UE. Transmitting multiple datapackets for different services on different active BWPs in parallel(e.g., simultaneously or overlapped in time) may reduce latency. In anexample, transmitting an eMBB data and an URLLC data on a single activeBWP may cause interruption of one transmission (e.g., eMBB) by anothertransmission (e.g., URLLC). In an example, transmitting multiple datapackets for different services on different active BWPs in parallel(e.g., simultaneously or overlapped in time) may avoid the interruption.In an example, existing BWP operation mechanism may not support multipleactive BWPs in a cell.

In an example, a gNB may transmit one or more messages comprisingconfiguration parameters of a cell, to a UE (e.g., a wireless device).The one or more messages may comprise one or more RRC messages (e.g. RRCconnection reconfiguration message, or RRC connection reestablishmentmessage, or RRC connection setup message). In an example, the cell maybe a Primary cell (or a PSCell), or a secondary cell when carrieraggregation or dual connectivity is configured. In an example, the cellmay comprise a plurality of downlink BWPs, wherein each of the pluralityof downlink BWPs may be associated with a BWP ID (e.g., a BWP specificID) and one or more parameters. In an example, the cell may comprise aplurality of uplink BWPs, wherein each of the plurality of uplink BWPsmay be associated with a BWP ID (e.g., a BWP specific ID) and one ormore second parameters.

In an example, each of the plurality of the downlink BWPs may be in oneof active state and inactive state. In an example, a wireless device mayapply operations on a BWP (DL or UL) in active state comprising:transmitting on UL-SCH; transmitting on RACH; monitoring a PDCCH;transmitting PUCCH; receiving DL-SCH; and/or (re-) initializing anysuspended configured uplink grants of configured grant Type 1 accordingto a stored configuration, if any. In an example, on a BWP (DL or UL) ininactive state, the wireless device: may not transmit on UL-SCH; may nottransmit on RACH; may not monitor a PDCCH; may not transmit PUCCH; maynot transmit SRS, may not receive DL-SCH; may clear any configureddownlink assignment and configured uplink grant of configured grant Type2; and/or may suspend any configured uplink grant of configured Type 1.

In an example, the one or more parameters may comprise at least one of:a control resource set identified by a control resource set index; asubcarrier spacing; a cyclic prefix; a DM-RS scrambling sequenceinitialization value; a number of consecutive symbols; a set of resourceblocks in frequency domain; a CCE-to-REG mapping; a REG bundle size; acyclic shift for the REG bundle; an antenna port quasi-co-location; anindication for a presence or absence of a TCI field for DCI format 1_0or 1_1 transmitted on the control resource set.

In an example, the configuration parameters may further indicate atleast one of: an initial active DL BWP, of the plurality of DL BWPs,identified by a first BWP ID and a default DL BWP, of the plurality ofDL BWPs, identified by a second BWP ID. In an example, the second BWP IDmay be same as or different from the first BWP ID. In an example, thedefault DL BWP may be in inactive state if the second BWP ID isdifferent from the first BWP ID of the initial active DL BWP.

In an example, the initial active DL BWP may be associated with one ormore control resource set for one or more common search space (e.g.,type0-PDCCH). In an example, a wireless device may monitor a first PDCCHon the initial active DL BWP on a PCell (or a PSCell) for detecting aDCI when switching from RRC idle state to RRC connected state.

In an example, when at least one of multiple types of services aretriggered for transmission on an additional BWP, a gNB may activate theadditional BWP dynamically (e.g., DCI, MAC CE). In an example, the gNBmay transmit a first command to the wireless device to activate a secondDL BWP, of the plurality of DL BWPs, identified by a third BWP ID. In anexample, the first command may be a MAC CE, or a DCI. In an example, thethird BWP ID is different from the first BWP ID and/or the second BWPID. In response to the activating, the wireless device may transit thesecond DL BWP from inactive state to active state and may keep theinitial active BWP in active state. In an example, in response to theactivating, the wireless device may monitor a first PDCCH on the initialactive DL BWP and a second PDCCH on the second DL BWP in parallel (e.g.,simultaneously or overlapped in time). In an example, activating thesecond DL BWP may not change the state of the initial active DL BWP. Inan example, with one active DL BWP (A-BWP1) of a plurality of activeBWPs in a cell, the gNB may transmit the first command (e.g., at timeT₁) to the wireless device to activate A-BWP2. In an example, A-BWP2 maybe different from A-BWP1. In response to the activating, the wirelessdevice may transit A-BWP2 from inactive state to active state and keepA-BWP1 in active state (e.g., at time T₂). In an example, activatingA-BWP 2 may not change the state of A-BWP1.

In an example, when multiple active BWPs are supported, a gNB maytransmit one or more RRC messages comprising configuration parametersindicating a first active DL BWP and at least a second active DL BWP ofa PCell (or a PSCell), to a wireless device. The wireless device maymonitor a first PDCCH on the first active DL BWP, and at least a secondPDCCH on the at least second active DL BWP, on a PCell (or a PSCell) fordetecting one or more DCI, e.g., when the wireless device is in RRCconnected mode, or switches from RRC idle state to RRC connected state.In an example, configuring multiple active BWPs by the one or more RRCmessages may reduce signaling overhead for BWP activation.

In an example, when multiple active BWPs are supported, a gNB maytransmit one or more RRC messages comprising configuration parametersindicating a first active DL BWP and at least a second active DL BWP ofa SCell, to a wireless device. The wireless device may monitor a firstPDCCH on the first active DL BWP, and at least a second PDCCH on the atleast second active DL BWP of the SCell for detecting one or more DCI,e.g., in response to the SCell being activated (e.g., by a MAC CE or aDCI). In an example, configuring multiple active BWPs by the one or moreRRC messages may reduce signaling overhead for BWP activation.

In an example, when there are two active DL BWPs (A-BWP1 and A-BWP2) ofa plurality of active BWPs in a cell (at time T₁), a gNB may transmit asecond command to a wireless device to switch from A-BWP1 to A-BWP3 (attime T₂). In an example, A-BWP1 may be the initial active DL BWPconfigured in the one or more messages. In an example, A-BWP 2 may be aDL BWP activated by the first command. In an example, the second commandmay be a MAC CE, or a DCI. In an example, A-BWP3 may be different fromA-BWP 1 and A-BWP2. In response to the switching, the wireless devicemay transit A-BWP1 from active state to inactive state, and transitA-BWP3 from inactive state to active state and may keep A-BWP2 in activestate. In an example, in response to the switching, the wireless devicemay monitor a first PDCCH on A-BWP3 and a second PDCCH on A-BWP2 inparallel (e.g., simultaneously or overlapped in time). In an example,switching to A-BWP3 from A-BWP1 may deactivate A-BWP1 and activateA-BWP3 at a time.

In an example, when there are two active DL BWPs (A-BWP1 and A-BWP2) ofa plurality of active BWPs in a cell, a gNB may transmit a third commandto a wireless device to deactivate A-BWP2. In an example, the thirdcommand may be a MAC CE, or a DCI. In an example, the gNB and/or thewireless device may deactivate A-BWP2 in response to a BWP inactivitytimer (e.g., associated with A-BWP2, or associated with the cell)expiring. In an example, the deactivating may comprise transiting A-BWP2from active state to inactive state and keeping A-BWP1 in active state(e.g., at time T₂). In an example, in response to the deactivating, thewireless device may monitor a first PDCCH on A-BWP1 and stop monitoringa second PDCCH on A-BWP2. In an example, deactivating A-BWP2 may notchange the state of A-BWP1.

In an example, a gNB and a wireless device may communicate on more than2 active DL BWPs in a cell. The gNB and/or the wireless device mayperform BWP activation, BWP deactivation, and BWP switching to flexiblyaccommodate different services. In an example, a gNB and a wirelessdevice may maintain a first active DL BWP for a first transmission of afirst service. In an example, when a second service is triggered, thegNB may activate a second DL BWP as a second active DL BWP. In responseto the activating, the wireless device may monitor one or more PDCCHsand/or receive data packets on both the first active DL BWP and thesecond active DL BWP. In an example, when a third service is triggered,the gNB and/or the wireless device may activate a third DL BWP as athird active DL BWP. In response to the activating, the wireless devicemay monitor one or more PDCCHs and/or receive data packets on the firstactive DL BWP, the second active DL BWP and the third active DL BWP.

In an example, to reduce blind decoding complexity, a gNB may cross-BWPschedule a second active DL BWP from a first active DL BWP. In anexample, cross-BWP scheduling may comprise scheduling, by a basestation, a transmission (downlink or uplink) on a shared channel(downlink or uplink) of a second BWP via control channels of a firstBWP. In an example, the first active DL BWP may be configured with afirst number of control resource set, and/or a second number of searchspace. In an example, the second active DL BWP may be configured with athird number of control resource set, and/or a fourth number of searchspace. In an example, the first number may be greater than the thirdnumber. In an example, the second number may be greater than the fourthnumber. In an example the second active DL BWP may be configured with noPDCCH resource.

In an example, a gNB may transmit a first PDCCH on a first active DL BWP(e.g., BWP 1) to schedule a first PDSCH of BWP 1, to a wireless device.In an example, the gNB may transmit a second PDCCH on BWP 1 to schedulea second PDSCH of a second active BWP (e.g., BWP 2) if BWP 2 isconfigured to be cross-BWP scheduled by BWP 1. In an example, the gNBmay transmit a third PDCCH on BWP 1 to schedule a third PDSCH of a thirdactive BWP (e.g., BWP 3) if BWP 3 is configured to be cross-BWPscheduled by BWP 1. In an example, the gNB may transmit a fourth PDCCHon BWP 3 to schedule a fourth PDSCH of BWP 3, e.g., if BWP 3 isconfigured to be self-scheduled. In an example, when cross BWPscheduling is supported, a wireless device may monitor one or more PDCCHon BWP 1 for at least one second BWP if the at least one second BWP isconfigured to be cross-BWP scheduled by BWP 1.

In an example, a PDSCH of an active BWP may be self-scheduled by a PDCCHof the active BWP. In an example, a gNB may schedule a first PDSCHresource on a first active BWP by a first PDCCH on the first active BWP.The gNB may schedule a second PDSCH resource on a second active BWP by asecond PDCCH on the second active BWP, etc.

In an example, with multiple active DL BWPs in a cell, a UE may monitorone or more PDCCH in one or more common search spaces on the multipleactive DL BWPs, wherein each of the multiple active DL BWPs isassociated with one of the one or more common search spaces. In anexample, configuring a common search space for each of multiple activeDL BWPs is not efficient for PDCCH resource utilization in the cell. Inan example, configuring a common search space for each of the multipleactive DL BWPs may require a wireless device monitoring multiple commonsearch spaces for the multiple active DL BWPs, which may consume batterypower inefficiently. Embodiments may provide methods to improve PDCCHresource utilization efficiency and battery power efficiency. Theembodiments may comprise designating a first active DL BWP, of multipleactive DL BWPs, as a primary active DL BWP (PBWP). In an example, theprimary active DL BWP may be the initial active DL BWP configured in theone or more messages. In an example, the primary active DL BWP may beassociated with one or more common search spaces, and one or moreUE-specific search spaces. In an example, the primary active BWP may bea BWP on which, the wireless device may perform an initial connectionestablishment procedure or may initiate a connection re-establishmentprocedure. In an example, the primary active DL BWP may be associatedwith one or more common search spaces for one or more DCI formats withCRC scrambled by one of: SI-RNTI; RA-RNTI; a TC-RNTI; P-RNTI; INT-RNTI;SFI-RNTI; TPC-PUSCH-RNTI; TPC-PUCCH-RNTI; TPC-SRS-RNTI; CS-RNTI;SP-CSI-RNTI; and/or or C-RNTI. In an example, the one or more commonsearch spaces may comprise at least one of: a type0-PDCCH common searchspace; a type0A-PDCCH common search space; a type1-PDCCH common searchspace; a type2-PDCCH common search space; a type3-PDCCH common searchspace. In an example, the one or more DCI formats may comprise at leastone of: a DCI format 0_0; a DCI format 0_1; a DCI format 1_0; a DCIformat 1_1; a DCI format 2_0; a DCI format 2_1; a DCI format 2_2; and/ora DCI format 2_3.

The designating of the PBWP may be indicated in an RRC message, or afirst MAC CE, or a first DCI. In an example, at least one second activeDL BWP of the multiple active DL BWPs is designated as at least onesecondary active DL BWP (SBWP). In an example, the designating of the atleast one SBWP may be indicated in a second MAC CE, or a second DCI. Inan example, a secondary active DL BWP may be associated with one or moreUE-specific search space. In an example, when designated with a PBWP anda SBWP in a cell, a wireless device may monitor one or more commonsearch spaces and one or more first UE-specific search spaces on a PBWP,and one or more second UE-specific search spaces on a SBWP in the cell.

In an example, with multiple DL BWPs being in active state in a cell,the gNB may designate, from the multiple active DL BWPs, a first activeDL BWP as a PBWP (e.g., PBWP1), and a second active DL BWP as a SBWP(e.g., SBWP1). A wireless device may monitor a first PDCCH on a PBWP1and a second PDCCH on a SBWP1. In an example, a gNB may transmit a firstcommand to switch from PBWP1 to a third BWP as a primary BWP (e.g.,PBWP2), to a wireless device. In response to switching from PBWP1 toPBWP2, the wireless device may transit PBWP1 from active state toinactive state and transit the third BWP from inactive state to activestate. The activated third BWP (PBWP2) may a primary active BWP inresponse to the switching. In response to the switching from PBWP1 toPBWP2, the wireless device may monitor a first PDCCH on common searchspaces and first UE-specific search spaces on PBWP2, and a second PDCCHon second UE-specific search spaces on SBWP1.

In an example, with a primary active BWP (e.g., PBWP1) of a plurality ofactive BWPs designated in a cell, a gNB may transmit a second command toa wireless device to activate a second DL BWP (e.g., SBWP1) as asecondary BWP. In an example, the second DL BWP is different from PBWP1and/or the plurality of active BWPs. In response to the activating, thewireless device may transit the second DL BWP from inactive state toactive state and keep PBWP1 in active state. The second DL BWP may bedesignated as a SBWP (SBWP1) in response to the activation. The wirelessdevice may monitor a first PDCCH on common search spaces and firstUE-specific search spaces on PBWP1, and a second PDCCH on secondUE-specific search spaces on SBWP1 in response to the activation.

In an example, with multiple DL BWPs being in active state in a cell, agNB may designate, from the multiple active DL BWPs, a first active DLBWP as a PBWP (e.g., PBWP1), and a second active DL BWP as a SBWP (e.g.,SBWP1), to a wireless device. The wireless device may monitor a firstPDCCH on a PBWP1 and a second PDCCH on a SBWP1. In an example, a gNB maytransmit a third command to switch from SBWP1 to a third BWP (e.g.,SBWP2) as a secondary BWP, to the wireless device. In response toswitching from SBWP1 to SBWP2, the wireless device may transit SBWP1from active state to inactive state and transit the third BWP frominactive state to active state. The activated third BWP may be asecondary active BWP in response to the switching. In response to theswitching from SBWP1 to SBWP2, the wireless device may monitor the firstPDCCH on common search spaces and first UE-specific search spaces onPBWP1, and a third PDCCH on second UE-specific search spaces on SBWP2.

In an example, with a primary active BWP (e.g., PBWP1) and a secondaryactive BWP (e.g., SBWP1) of a plurality of active DL BWPs designated ina cell, a gNB may transmit a fourth command to a wireless device todeactivate SBWP1. In an example, the command may be a MAC CE, or a DCI.In an example, the gNB and/or the wireless device may deactivate SBWP1in response to a BWP inactivity timer expiring. In an example, the BWPinactivity timer may be associated with SBWP1. In response to thedeactivating, the wireless device may transit SBWP1 from active state toinactive state and keep PBWP1 in active state. In an example, inresponse to the deactivating, the wireless device may monitor a firstPDCCH on PBWP1 and stop monitoring a second PDCCH on SBWP1. In anexample, deactivating SBWP1 may not change the state of PBWP1.

In an example, with multiple active DL BWPs comprising a PBWP and atleast one SBWP in a cell, a gNB and a wireless device may not allow aPBWP switching to a second active BWP by a MAC CE, or a DCI. In anexample, the gNB and the wireless device may trigger a SBWPdeactivation, a SBWP activation, and/or a SBWP switching. In an example,keeping PBWP unswitchable may simplify signaling design, and/or reduceimplementation complexity of the wireless device. In an example, thePBWP may be switched to the second PBWP only by an RRC message. In anexample, the RRC message triggering PBWP switching may enable a gNBstatically switching the PBWP.

In an example, with a primary active BWP (e.g., PBWP1) of a plurality ofactive DL BWPs designated in a cell, a gNB may transmit a first commandto a wireless device to activate a second DL BWP as a secondary BWP(e.g., SBWP1). In an example, the second DL BWP may be different fromPBWP1 and/or the plurality of active BWPs. In response to theactivating, the wireless device may transit the second DL BWP frominactive state to active state and may keep PBWP1 in active state. Thesecond DL BWP may be designated as a SBWP (SBWP1) in response to theactivation. The wireless device may monitor a first PDCCH on commonsearch spaces and first UE-specific search spaces on PBWP1, and a secondPDCCH on second UE-specific search spaces on SBWP1 in response to theactivation.

In an example, with a primary active BWP (e.g., PBWP1) and a secondaryactive BWP (e.g., SBWP1) of a plurality of active DL BWPs designated ina cell, a gNB may transmit a second command to a wireless device todeactivate SBWP1. In an example, the command may be a MAC CE, or a DCI.In an example, the gNB and/or the wireless device may deactivate SBWP1in response to a BWP inactivity timer expiring. In an example, the BWPinactivity timer may be associated with SBWP1. In response to thedeactivating, the wireless device may transit SBWP1 from active state toinactive state and may keep PBWP1 in active state. In an example, inresponse to the deactivating, the wireless device may monitor a firstPDCCH on PBWP1 and may stop monitoring a second PDCCH on SBWP1.

In an example, with multiple DL active BWPs in a cell, a gNB maydesignate, from the multiple DL active BWPs, a first active DL BWP as aPBWP (e.g., PBWP1), and a second active DL BWP as a SBWP (e.g., SBWP1),to a wireless device. The wireless device may monitor a first PDCCH on aPBWP1 and a second PDCCH on a SBWP1. In an example, a gNB may transmit athird command to switch from SBWP1 to a third BWP as a secondary BWP(e.g., SBWP2), to the wireless device. In response to switching fromSBWP1 to SBWP2, the wireless device may transit SBWP1 from active stateto inactive state and transit the third BWP from inactive state toactive state. The activated third BWP may a secondary active BWP (e.g.,SBWP2). In response to the switching from SBWP1 to SBWP2, the wirelessdevice may monitor the first PDCCH on common search spaces and firstUE-specific search spaces on PBWP1, and a third PDCCH on secondUE-specific search spaces on SBWP2.

In an example, a gNB may transmit one or more messages comprisingconfiguration parameters of a plurality of DL BWPs in a cell, to awireless device. In an example, multiple DL BWPs of a plurality of DLBWPs are activated as active DL BWPs. In an example, a wireless deviceand a gNB may communicate on the active DL BWPs comprising a PBWP and aSBWP. In an example, the PBWP may be switched to a first DL BWP as a newPBWP. In an example, the SBWP may be switched to a second DL BWP as anew SBWP. In an example, the SBWP may be deactivated. In an example, athird BWP may be activated as a second SBWP. In an example, a gNB maytransmit one or more DCI indicating a PBWP switching, or a SBWPactivation, or a SBWP deactivation, or a SBWP switching, or a PDSCHscheduling on a PBWP or on an SBWP, based on at least one of: one ormore values of one or more fields of the one or more DCI; whether theone or more DCI is transmitted on a PBWP or a SBWP. In an example, theone or more DCI may be transmitted with DCI format 1_0 or 1_1 indicatinga PDSCH scheduling. In an example, the one or more fields may compriseat least one of: a carrier indicator; an identifier for DCI format; aBWP indicator; a first field indicating a frequency domain resourceassignment; a second field indicating a time domain resource assignment;a PUCCH resource indicator; a TPC command for scheduled PUCCH; aPDSCH-to-HARQ feedback timing indicator. In an example, reusing anexisting DCI format (e.g., DCI format 1_0 or 1_1) for a BWP operationsupporting multiple active BWPs may reduce blind decoding complexity ata wireless device.

In an example, a wireless device may switch the PBWP to a first BWP as anew PBWP identified by the BWP indicator, in response to at least oneof: the one or more DCI being transmitted on the PBWP; the BWP indicatorindicating the first BWP different from the PBWP and the SBWP (e.g., ifexisting); a value of the first field and/or the second field beingdifferent from a first value (e.g., all-zeros) and/or a second value(e.g., all-ones). In an example, the first value and/or the second valuemay be predefined (e.g., fixed).

In an example, the wireless device may switch the SBWP to a second BWPas a new SBWP identified by the BWP indicator, in response to at leastone of: the one or more DCI being transmitted on the SBWP; the BWPindicator indicating the second BWP different from the PBWP and theSBWP; a value of the first field and/or the second field being differentfrom the first value (e.g., all-zeros) and/or the second value (e.g.,all-ones).

In an example, the wireless device may activate a third BWP as a newSBWP identified by the BWP indicator, in response to at least one of:the BWP indicator indicating the third BWP different from the PBWP andthe SBWP; and/or the value of the first field and/or the second fieldbeing the first value (e.g., all-zeros).

In an example, the wireless device may deactivate the SBWP, in responseto at least one of: the one or more DCI being transmitted on the PBWP;the BWP indicator indicating the SBWP; and/or the value of the firstfield or the second field being the second value (e.g., all-ones).

In an example, the wireless device may receive a DL assignment on a PBWP(e.g., without PBWP switching), in response to at least one of: the BWPindicator indicating the PBWP; the value of the first field or thesecond field being different from the first value (e.g., all-zeros)and/or the second value (e.g., all-ones). In an example, the wirelessdevice may receive a DL assignment on a SBWP (e.g., without SBWPswitching/activation/deactivation), in response to at least one of: theBWP indicator indicating the SBWP; the value of the first field or thesecond field being different from the first value (e.g., all-zeros)and/or the second value (e.g., all-ones). In an example, in response toreceiving the DL assignment on the PBWP, the wireless device may receiveone or more DL data packets from a first PDSCH on the PBWP. In anexample, in response to receiving the DL assignment on the SBWP, thewireless device may receive one or more DL data packet from a secondPDSCH on the SBWP.

In an example, a gNB and a wireless device may support a PBWP and atmost one SBWP of a plurality of BWPs. In an example, supporting the PBWPand at most one SBWP, compared with one single active BWP in a cell, mayimprove spectrum efficiency and keep an acceptable implementationcomplexity of the gNB and the wireless device.

In an example, when a PBWP and at most one SBWP of a plurality of DLBWPs are supported, a gNB may transmit one or more DCI indicating a PBWPswitching, or a SBWP activation, or a PDSCH scheduling on a PBWP or onan SBWP, based on at least one of: one or more values of one or morefields of the one or more DCI; whether the one or more DCI istransmitted on a PBWP or a SBWP. In an example, activation of a SBWP maycomprise deactivating a first SBWP and activating a first inactive BWPas the SBWP at a time. In an example, activation of an SBWP may compriseactivating a first inactive BWP as the SBWP, e.g., when there is no SBWPbefore the activating.

In an example, when a PBWP and at most one SBWP of a plurality of BWPsare supported, a gNB may transmit one or more DCI indicating a PBWPswitching in response to at least one of: the BWP indicator indicating afirst BWP different from the PBWP and the SBWP; the one or more DCIbeing transmitted on the PBWP; one or more value of the first fieldand/or the second field being different from a first value (e.g.,all-zeros) and/or a second value (e.g., all-ones). In an example, thefirst value and/or the second value may be predefined (e.g., fixed).

In an example, when a PBWP and at most one SBWP of a plurality of BWPsare supported, a gNB may transmit one or more DCI indicating a SBWPactivation in response to at least one of: the BWP indicator indicatinga BWP different from the PBWP (e.g., if there is no SBWP in the cell);the BWP indicator indicating the BWP different from the SBWP; the one ormore DCI being transmitted on the PBWP; the one or more DCI beingtransmitted on the SBWP; one or more value of the first field and/or thesecond field being the first value (e.g., all-zeros); and/or the valueof the first field or the second field being the second value (e.g.,all-ones).

In an example, when a SBWP activation or deactivation is not timeurgent, a gNB may transmit a MAC CE to activate or deactivate a SBWP, toa wireless device. In an example, the gNB may transmit a DCI to switchfrom a first PBWP to a second BWP as a second PBWP, or switch from afirst SBWP to a third BWP as a second SBWP.

In an example, a MAC CE may comprise at least one of: one or more firstfields indicating activation or deactivation of one or more DL BWPs; oneor more second fields indicating activation or deactivation of one ormore UL BWPs. In an example, the one or more first fields may comprise anumber of bits (e.g., D₄, D₃, D₂, D₁ in case of 4 bits). In an example,each of the number of bits may indicate activation of a corresponding DLBWP, in response to the bit being set to a first value (e.g., 1). In anexample, each of the number of bits may indicate deactivation of acorresponding DL BWP, in response to the bit being set to a second value(e.g., 0). In an example, D₄ being set to the first value may indicate aDL BWP associated with BWP ID 4 is activated if the DL BWP isconfigured. In an example, D₄ being set to the second value may indicatea DL BWP associated with BWP ID 4 is deactivated if the DL BWP isconfigured. In an example, if the DL BWP associated by BWP ID 4 is notconfigured, the wireless device may ignore D₄. In an example, thewireless device may activate/deactivate a DL BWP associated with BWP ID3 based on a value of D₃ if the DL BWP associated with BWP ID 3 isconfigured. In an example, the wireless device may activate/deactivate aDL BWP associated with BWP ID 2 based on a value of D₂ if the DL BWPassociated with BWP ID 2 is configured. In an example, the wirelessdevice may activate/deactivate a DL BWP associated with BWP ID 1 basedon a value of D₁ if the DL BWP associated with BWP ID 1 is configured.In an example, an RRC message may indicate an association between a DLBWP and a BWP ID.

In an example, the one or more second fields may comprise a number ofbits (e.g., U4, U3, U2, U1 in case of 4 bits). In an example, each ofthe number of bits may indicate activation of a corresponding UL BWP, inresponse to the bit being set to a first value (e.g., 1), if the UL BWPis configured. In an example, each of the number of bits may indicatedeactivation of a corresponding UL BWP, in response to the bit being setto a second value (e.g., 0), if the UL BWP is configured. In an example,if an UL BWP associated by BWP ID i is not configured, the wirelessdevice may ignore U_(i).

In an example, the MAC subheader for BWP activation/deactivation maycomprise at least one of: a reserved field; a flag field; a LCID fieldwith a first value indicating the MAC CE for BWPactivation/deactivation; a length field. In an example, the LCID fieldmay be the first value different from other LCID values. In an example,the MAC subheader may not comprise the length field, e.g., in responseto the MAC CE for SBWP activation/deactivation having a fixed bitlength.

In an example, when one or more MAC CEs is used foractivating/deactivating one or more SBWPs, the gNB may transmit one ormore DCIs to switch from a first PBWP to a second BWP as a second PBWP,or switch from a first SBWP to a third BWP as a second SBWP, based on atleast one of: one or more values of one or more fields of the one ormore DCIs; whether the one or more DCIs is transmitted on a PBWP or aSBWP.

In an example, the wireless device may switch the PBWP to a first BWP asa new PBWP identified by the BWP indicator, in response to at least oneof: the one or more DCIs being transmitted on the PBWP; the BWPindicator indicating the first BWP different from the PBWP and the SBWP(e.g., if existing).

In an example, the wireless device may switch the SBWP to a second BWPas a new SBWP identified by the BWP indicator, in response to at leastone of: the one or more DCIs being transmitted on the SBWP; the BWPindicator indicating the second BWP different from the PBWP and theSBWP.

In an example, the wireless device may receive a DL assignment on a PBWP(e.g., without PBWP switching), in response to the BWP indicatorindicating the PBWP. In an example, the wireless device may receive a DLassignment on a SBWP (e.g., without SBWP switching/activation), inresponse to the BWP indicator indicating the SBWP. In an example, inresponse to receiving the DL assignment on the PBWP, the wireless devicemay receive one or more DL data packets from a first PDSCH on the PBWP.In an example, in response to receiving the DL assignment on the SBWP,the wireless device may receive one or more DL data packets from asecond PDSCH on the SBWP.

In an example, when a PBWP and at most one SBWP of a plurality of BWPsare supported and one or more MAC CEs are used foractivating/deactivating a SBWP, a gNB may transmit one or more DCIindicating a PBWP switching, or a PDSCH scheduling on a PBWP or a SBWP,based on a BWP indicator. In an example, the wireless device may switchthe PBWP to a first BWP as a new PBWP identified by the BWP indicator,in response to the BWP indicator indicating the first BWP different fromthe PBWP and the SBWP (e.g., if existing). In an example, the wirelessdevice may receive a DL assignment on a PBWP (e.g., without PBWPswitching), in response to the BWP indicator indicating the PBWP. In anexample, the wireless device may receive a DL assignment on a SBWP(e.g., without SBWP switching/activation), in response to the BWPindicator indicating the SBWP. In an example, in response to receivingthe DL assignment on the PBWP, the wireless device may receive one ormore DL data packets from a first PDSCH on the PBWP. In an example, inresponse to receiving the DL assignment on the SBWP, the wireless devicemay receive one or more DL data packets from a second PDSCH on the SBWP.

In an example, one or more MAC CEs for SBWP activation/deactivation mayintroduce intolerant transition latency (e.g., scheduling the MAC CE inPDSCH resources and sending one or more HARQ feedback for the MAC CE inPUCCH/PUSCH resources) for some services (e.g., URLLC). In an example, awireless device may receive multiple types of services which may requirea quick SBWP activation/deactivation. Embodiments may reduce thetransition latency by introducing a first DCI format, different from oneor more existing DCI formats (e.g., DCI format 1_0/1_1). The first DCIformat may comprise one or more fields indicating a PBWP switching, aSBWP activation, a SBWP deactivation, or a SBWP switching based on oneor more values of the one or more fields of the first DCI format. In anexample, the first DCI format may comprise at least one of: a BWPindicator; a second field (e.g., BWP action/mode indication) indicatingone of PBWP switching, a SBWP activation, a SBWP deactivation and a SBWPswitching.

In an example, when receiving one or more DCIs with the first DCIformat, a wireless device may switch a PBWP to a first BWP as a newPBWP, in response to at least one of: the BWP indicator (e.g., BWP ID)indicating the first BWP; the first BWP being different from the PBWP;and/or the second field being set to a first value (e.g., “00” in caseof two bits). In an example, the wireless device may receive a DLassignment on a PBWP (e.g., without PBWP switching), in response to theBWP indicator indicating the PBWP and/or the second field being set to afirst value (e.g., “00” in case of two bits).

In an example, when receiving the one or more DCIs with the first DCIformat, the wireless device may activate a second BWP as a SBWP, inresponse to at least one of: the BWP indicator indicating the secondBWP; and/or the second field being set to a second value (e.g., “01” incase of two bits).

In an example, when receiving the one or more DCIs with the first DCIformat, the wireless device may deactivate a SBWP, in response to atleast one of: the BWP indicator indicating the SBWP; and the secondfield being set to a third value (e.g., “10” in case of two bits).

In an example, when receiving the one or more DCIs with the first DCIformat, the wireless device may switch a SBWP to a third BWP, inresponse to at least one of: the BWP indicator indicating the third BWP;the third BWP being different from the PBWP and the SBWP; and/or thesecond field being set to a fourth value (e.g., “11” in case of twobits). In an example, the wireless device may receive a DL assignment ona SBWP (e.g., without SBWP switching), in response to the BWP indicatorindicating the SBWP and/or the second field being set to a fourth value(e.g., “11” in case of two bits).

In an example, a gNB may transmit a first DCI with an existing DCIformat (e.g., DCI format 1_0/1_1) indicating PBWP/SBWP switching, or DLscheduling on the PBWP/SBWP.

In an example, a gNB may transmit a second DCI with a second DCI format(e.g., different from the existing DCI format) indicating SBWPactivation/deactivation. In an example, the second DCI format maycomprise at least one of: a BWP indicator; a second field indicatingactivation or deactivation of a SBWP.

In an example, when receiving the first DCI with the existing DCI format(e.g., DCI format 1_0/1_1), a wireless device may switch from the PBWPto a first BWP as a new PBWP in response to the BWP indicator indicatingthe first BWP different from the PBWP and/or the first DCI beingtransmitted on the PBWP. In an example, the wireless device may receivea DL assignment on the PBWP in response to the BWP indicator indicatingthe PBWP.

In an example, when receiving the first DCI with the existing DCI format(e.g., DCI format 1_0/1_1), a wireless device may switch from the SBWPto a second BWP as a new SBWP in response to the BWP indicatorindicating the second BWP different from the SBWP and/or the first DCIbeing transmitted on the SBWP. In an example, the wireless device mayreceive a DL assignment on the SBWP in response to the BWP indicatorindicate the SBWP.

In an example, when receiving the second DCI with the second DCI format(e.g., different from DCI format 1_0/1_1), a wireless device mayactivate a third BWP indicated by the BWP indicator as a second SBWP inresponse to the second field of the second DCI being a first value(e.g., “1” in case of one bit).

In an example, when receiving the second DCI with the second DCI format(e.g., different from DCI format 1_0/1_1), a wireless device maydeactivate the SBWP indicated by the BWP indicator in response to thesecond field of the second DCI being a second value (e.g., “0” in caseof one bit).

In an example, when at most one SBWP is supported, a gNB may transmit aDCI with a third DCI format (e.g., different from existing DCI format1_0/1_1) indicating a PBWP switching, or a SBWP activation. In anexample, the third DCI format may comprise at least one of: a BWPindicator; a second field indicating a PBWP switching or a SBWPactivation based on a value of the second field. In an example, when atmost one SBWP is supported, activation of a BWP as a new SBWP maydeactivate a SBWP (e.g., if existing) and activate the BWP as the newSBWP at a time.

In an example, a gNB may transmit the DCI with the third DCI format to awireless device. In an example, when the wireless device receives theDCI and at most one SBWP is supported, the wireless device may switchfrom the PBWP to a first BWP indicated by the BWP indicator, as a newPBWP, in response to the second field being a first value (e.g., “1” incase of one bit). In an example, the wireless device may receive a DLassignment on the PBWP if the BWP indicator indicate the PBWP.

In an example, when the wireless device receives the DCI with the thirdDCI format and at most one SBWP is supported, the wireless device mayactivate a second BWP indicated by the BWP indicator, as a new SBWP, inresponse to the second field being a second value (e.g., “0” in case ofone bit). In an example, the wireless device may deactivate a first SBWP(e.g., if existing) in response to activating the second BWP. In anexample, the wireless device may receive a DL assignment on the SBWP ifthe BWP indicator indicate the SBWP.

In an example, a gNB may transmit one or more DCIs (e.g., DCI format1_0/1_1) to a wireless device indicating a SBWP activation, or a SBWPdeactivation, or a SBWP switching, based on at least one of: one or morevalues of one or more fields of the one or more DCI; whether the one ormore DCI is transmitted on a PBWP or a SBWP. In an example, the one ormore DCIs may be transmitted with DCI format 1_0 or 1_1 indicating aPDSCH scheduling. In an example, the one or more fields may comprise atleast one of: a carrier indicator; an identifier for DCI format; a BWPindicator; a first field indicating a frequency domain resourceassignment; a second field indicating a time domain resource assignment;a PUCCH resource indicator; a TPC command for scheduled PUCCH; aPDSCH-to-HARQ feedback timing indicator. In an example, reusing anexisting DCI format (e.g., DCI format 1_0 or 1_1) for a BWP operationsupporting multiple active BWPs may reduce blind decoding complexity ata wireless device. In an example, a PBWP may be in active state untilreceiving an RRC message.

In an example, the wireless device may switch the SBWP to a first BWP asa new SBWP identified by the BWP indicator, in response to at least oneof: the one or more DCIs being transmitted on the SBWP; the BWPindicator indicating the first BWP different from the PBWP and the SBWP;a value of the first field or the second field being different from afirst value (e.g., all-zeros); and/or the value of the first field orthe second field being different from a second value (e.g., all-ones).In an example, the first value and/or the second value may be predefined(e.g., fixed).

In an example, the wireless device may activate a second BWP as a newSBWP identified by the BWP indicator, in response to at least one of:the BWP indicator indicating the second BWP different from the PBWP andthe SBWP; and/or the value of the first field or the second field beingthe first value (e.g., all-zeros).

In an example, the wireless device may deactivate the SBWP, in responseto at least one of: the one or more DCIs being transmitted on the PBWP;the BWP indicator indicating the SBWP different from the PBWP; and/orthe value of the first field or the second field being the second value(e.g., all-ones).

In an example, when a PBWP and at most one SBWP are supported, a gNB maytransmit one or more DCIs indicating a SBWP activation in response to atleast one of: the BWP indicator indicating a BWP different from the PBWP(e.g., if there is no SBWP in the cell); the BWP indicator indicatingthe BWP different from the SBWP; the one or more DCIs being transmittedon the PBWP; and/or the one or more DCI being transmitted on the SBWP.

In an example, activation of a SBWP may comprise deactivating a firstSBWP and activating a first inactive BWP as the SBWP at a time. In anexample, activation of a SBWP may comprise activating a first inactiveBWP as the SBWP, e.g., when there is no active SBWP before theactivating.

In an example, the wireless device may receive a DL assignment on a PBWP(e.g., without PBWP switching), in response to the BWP indicatorindicating the PBWP. In an example, the wireless device may receive a DLassignment on a SBWP (e.g., without SBWP switching/activation), inresponse to the BWP indicator indicating the SBWP. In an example, inresponse to receiving the DL assignment on the PBWP, the wireless devicemay receive one or more DL data packets from a first PDSCH on the PBWP.In an example, in response to receiving the DL assignment on the SBWP,the wireless device may receive one or more DL data packets from asecond PDSCH on the SBWP.

In an example, when a SBWP activation or deactivation is not timeurgent, a gNB may transmit a MAC CE to activate or deactivate a SBWP, toa wireless device. In an example, the gNB may transmit a DCI to switchfrom a first SBWP to a second BWP as a second SBWP, wherein a PBWP maybe in active state until switched by an RRC message.

In an example, when one or more MAC CEs are used foractivating/deactivating a SBWP and the PBWP is in active state untilswitched by an RRC message, the gNB may transmit one or more DCIs (e.g.,DCI format 1_0/1_1) to switch from a first SBWP to a second BWP as asecond SBWP, based on at least one of: one or more values of one or morefields of the one or more DCIs; whether the one or more DCIs istransmitted on a PBWP or a SBWP.

In an example, the wireless device may switch a first SBWP to a secondBWP as a second SBWP identified by the BWP indicator, in response to atleast one of: the one or more DCIs being transmitted on the first SBWP;the BWP indicator indicating the second BWP different from the PBWP andthe first SBWP.

In an example, the wireless device may receive a DL assignment on aPBWP, in response to the BWP indicator indicating the PBWP. In anexample, the wireless device may receive a DL assignment on a SBWP(e.g., without SBWP switching), in response to the BWP indicatorindicating the SBWP. In an example, in response to receiving the DLassignment on the PBWP, the wireless device may receive one or more DLdata packets from a first PDSCH on the PBWP. In an example, in responseto receiving the DL assignment on the SBWP, the wireless device mayreceive one or more DL data packets from a second PDSCH on the SBWP.

In an example, when a PBWP and at most one SBWP of a plurality of BWPsare supported and one or more MAC CEs are used foractivating/deactivating a SBWP, a gNB may transmit one or more DCIsindicating a PDSCH scheduling on a PBWP or a SBWP, based on a BWPindicator of the one or more DCIs. In an example, the wireless devicemay receive a DL assignment on a PBWP, in response to the BWP indicatorindicating the PBWP. In an example, the wireless device may receive a DLassignment on a SBWP (e.g., without SBWP switching/activation), inresponse to the BWP indicator indicating the SBWP. In an example, inresponse to receiving the DL assignment on the PBWP, the wireless devicemay receive one or more DL data packets from a first PDSCH on the PBWP.In an example, in response to receiving the DL assignment on the SBWP,the wireless device may receive one or more DL data packets from asecond PDSCH on the SBWP.

In an example, a wireless device may perform SBWP switching based on theone or more MAC CEs. In an example, a gNB may transmit the one or moreMAC CEs indicating activating a second SBWP and deactivating a firstSBWP by setting a second field of the one or more first fieldscorresponding the second SBWP to a first value (e.g., “1”) and setting afirst field of the one or more first fields corresponding to the firstSBWP to a second value (e.g., “0”). In an example, in response toreceiving the one or more MAC CEs, the wireless device may switch fromthe first SBWP to the second SBWP.

In an example, one or more MAC CEs for SBWP activation/deactivation mayintroduce intolerant transition latency (e.g., scheduling the MAC CE inPDSCH resources at a gNB and sending one or more HARQ feedbacks for theMAC CE in PUCCH/PUSCH resources at a wireless device) for some services(e.g., URLLC). In an example, a wireless device may receive multipletypes of services which may require a quick SBWPactivation/deactivation. Embodiments may reduce the transition latencyby introducing a first DCI format, different from one or more existingDCI formats (e.g., DCI format 1_0/1_1). The first DCI format maycomprise one or more fields indicating SBWPactivation/deactivation/switching based on one or more values of the oneor more fields of the first DCI format. In an example, the first DCIformat may comprise at least one of: a BWP indicator; a second field(e.g., BWP action/mode indication) indicating one of SBWP activation,SBWP deactivation and SBWP switching, wherein a PBWP may be in activestate until switched/deactivated by an RRC message.

In an example, when receiving one or more DCIs with the first DCIformat, a wireless device may receive a DL assignment on a PBWP inresponse to a BWP indicator indicating the PBWP and/or the second fieldbeing set to a first value (e.g., “00” in case of two bits). In anexample, when receiving one or more DCIs with the first DCI format, awireless device may receive a DL assignment on a SBWP in response to theBWP indicator indicating the SBWP and/or the second field being set to afirst value (e.g., “00” in case of two bits).

In an example, when receiving the one or more DCIs with the first DCIformat, the wireless device may activate a first BWP as a SBWP, inresponse to at least one of: the BWP indicator indicating the first BWP;and/or the second field being set to a second value (e.g., “01” in caseof two bits).

In an example, when receiving the one or more DCIs with the first DCIformat, the wireless device may deactivate a SBWP, in response to atleast one of: the BWP indicator indicating the SBWP; and the secondfield being set to a third value (e.g., “10” in case of two bits).

In an example, when receiving the one or more DCIs with the first DCIformat, the wireless device may switch a SBWP to a second BWP, inresponse to at least one of: the BWP indicator indicating the secondBWP; the second BWP being different from the PBWP and the SBWP; and/orthe second field being set to a fourth value (e.g., “11” in case of twobits).

In an example, a gNB may transmit a first DCI with an existing DCIformat (e.g., DCI format 1_0/1_1) indicating SBWP switching, or DLscheduling on the PBWP/SBWP.

In an example, a gNB may transmit a second DCI with a second DCI format(e.g., different from the existing DCI format, e.g., DCI format 1_0/1_1)indicating SBWP activation/deactivation. In an example, the second DCIformat may comprise at least one of: a BWP indicator; a second fieldindicating activation or deactivation of a SBWP.

In an example, when receiving the first DCI with the existing DCI format(e.g., DCI format 1_0/1_1), a wireless device may switch from the SBWPto a first BWP as a new SBWP in response to the BWP indicator indicatingthe first BWP different from the SBWP and/or the first DCI beingtransmitted on the SBWP.

In an example, when receiving the second DCI with the second DCI format(e.g., different from DCI format 1_0/1_1), a wireless device mayactivate a second BWP indicated by the BWP indicator as a second SBWP inresponse to the second field of the second DCI being a first value(e.g., “1” in case of one bit).

In an example, when receiving the second DCI with the second DCI format(e.g., different from DCI format 1_0/1_1), a wireless device maydeactivate the SBWP indicated by the BWP indicator in response to thesecond field of the second DCI being a second value (e.g., “0” in caseof one bit).

In an example, when at most one SBWP is supported, a gNB may transmit aDCI with a DCI format (e.g., existing DCI format 1_0/1_1) indicating aSBWP activation. In an example, a wireless device may activate a firstBWP as a second SBWP in response to the BWP indicator indicating thefirst BWP different from a first SBWP and the PBWP. In an example, whenat most one SBWP is supported and the PBWP is in active state untilswitched/deactivated by an RRC message, the activating the first BWP asthe second SBWP may comprise deactivating the first SBWP and activatingthe first BWP as the second SBWP at a time. In an example, when at mostone SBWP is supported and the PBWP is in active state untilswitched/deactivated by an RRC message, the activating the first BWP asthe second SBWP may comprise activating the first BWP as the secondSBWP, if there is no SBWP before the activating.

In an example, a wireless device may support a plurality of active BWPsin a cell, wherein no PBWP or SBWP of the plurality of active BWPs isdesignated. In an example, a gNB may transmit one or more DCIsindicating an active BWP switching, or a BWP activation, a BWPdeactivation, or a PDSCH scheduling on the active BWP, based on at leastone of: one or more values of one or more fields of the one or moreDCIs. In an example, the one or more DCIs may be transmitted with DCIformat 1_0 or 1_1 indicating a PDSCH scheduling. In an example, the oneor more fields may comprise at least one of: a carrier indicator; anidentifier for DCI format; a BWP indicator; a first field indicating afrequency domain resource assignment; a second field indicating a timedomain resource assignment; a PUCCH resource indicator; a TPC commandfor scheduled PUCCH; a PDSCH-to-HARQ feedback timing indicator. In anexample, reusing an existing DCI format (e.g., DCI format 1_0 or 1_1)for a BWP operation supporting multiple active BWPs may reduce blinddecoding complexity at a wireless device.

In an example, with active BWPs in active state, a wireless device mayswitch from a first active BWP to a second BWP identified by the BWPindicator, in response to at least one of: the one or more DCIs beingtransmitted on the first active BWP; the BWP indicator indicating thesecond BWP different from the active BWPs; one or more value of thefirst field and/or the second field being different from a first value(e.g., all-zeros); and/or the value of the first field or the secondfield being different from a second value (e.g., all-ones).

In an example, with active BWPs in active state, the wireless device mayactivate a third BWP identified by the BWP indicator, in response to atleast one of: the BWP indicator indicating the third BWP different fromthe active BWPs; and/or the value of the first field or the second fieldbeing the first value (e.g., all-zeros).

In an example, with active BWPs in active state, the wireless device maydeactivate an active BWP, in response to at least one of: the BWPindicator indicating the active BWP; and/or the value of the first fieldor the second field being the second value (e.g., all-ones).

In an example, the wireless device may receive a DL assignment on anactive BWP (e.g., without active BWP switching), in response to at leastone of: the BWP indicator indicating the active BWP; the value of thefirst field or the second field not being the first value (e.g.,all-zeros); and/or the value of the first field or the second field notbeing the second value (e.g., all-ones). In an example, in response toreceiving the DL assignment on the active BWP, the wireless device mayreceive one or more DL data packets from a PDSCH on the active BWP.

In an example, a wireless device may support a plurality of active BWPsin a cell, wherein no PBWP or SBWP of the plurality of active BWPs isdesignated. In an example, when BWP activation or deactivation is nottime urgent, a gNB may transmit a MAC CE to activate or deactivate aBWP, to a wireless device. In an example, the gNB may transmit a DCI toswitch from a first active BWP to a second BWP as a second active BWP.

In an example, with active BWPs in active state, a wireless device mayswitch from a first active BWP to a second BWP identified by the BWPindicator, in response to at least one of: the BWP indicator indicatingthe second BWP different from the active BWPs; the DCI being transmittedon the first active BWP.

In an example, the wireless device may receive a DL assignment on anactive BWP (e.g., without active BWP switching), in response to at leastone of: the BWP indicator indicating the active BWP. In an example, inresponse to receiving the DL assignment on the active BWP, the wirelessdevice may receive one or more DL data packets from a PDSCH on theactive BWP.

In an example, a wireless device may support a plurality of active BWPsin a cell, wherein no PBWP or SBWP of the plurality of active BWPs isdesignated. In an example, one or more MAC CEs for SBWPactivation/deactivation may introduce intolerant transition latency(e.g., scheduling the MAC CE in PDSCH resources and sending one or moreHARQ feedbacks for the MAC CE in PUCCH/PUSCH resources) for someservices (e.g., URLLC). In an example, a wireless device may receivemultiple types of services which may require quick SBWPactivation/deactivation.

In an example, when receiving one or more DCIs with the first DCI formatand multiple BWPs are in active state, a wireless device may switch afirst active BWP to a first BWP as a second active BWP, in response toat least one of: the BWP indicator indicating the first BWP; the firstBWP being different from the multiple BWPs; and/or the second fieldbeing set to a first value (e.g., “00” in case of two bits). In anexample, the wireless device may receive a DL assignment on an activeBWP (e.g., without BWP switching), in response to the BWP indicatorindicating the active BWP and/or the second field being set to a firstvalue (e.g., “00” in case of two bits).

In an example, when receiving the one or more DCIs with the first DCIformat and multiple BWPs are in active state, the wireless device mayactivate a second BWP as an active BWP, in response to at least one of:the BWP indicator indicating the second BWP; and/or the second fieldbeing set to a second value (e.g., “01” in case of two bits).

In an example, when receiving the one or more DCIs with the first DCIformat and multiple BWPs are in active state, the wireless device maydeactivate an active BWP, in response to at least one of: the BWPindicator indicating the active BWP; and the second field being set to athird value (e.g., “10” in case of two bits).

In an example, when receiving the one or more DCIs with the first DCIformat and multiple BWPs are in active state, the wireless device mayswitch a first active BWP to a third BWP, in response to at least oneof: the BWP indicator indicating the third BWP; the third BWP beingdifferent from the multiple BWPs; and/or the second field being set to afourth value (e.g., “11” in case of two bits).

In an example, a gNB may transmit a first DCI with an existing DCIformat (e.g., DCI format 1_0/1_1) indicating BWP switching, or DLscheduling on an active BWP.

In an example, a gNB may transmit a second DCI with a second DCI format(e.g., different from the existing DCI format) indicating BWPactivation/deactivation. In an example, the second DCI format maycomprise at least one of: a BWP indicator; a second field indicatingactivation or deactivation of a BWP.

In an example, when receiving the first DCI with the existing DCI format(e.g., DCI format 1_0/1_1) and multiple BWPs are in active state, awireless device may switch from a first active BWP to a first BWP as asecond active BWP in response to the BWP indicator indicating the firstBWP different from the multiple active BWPs and/or the first DCI beingtransmitted on the first active BWP. In an example, the wireless devicemay receive a DL assignment on the first active BWP if the BWP indicatorindicates the first active BWP.

In an example, when receiving the second DCI with the second DCI format(e.g., different from DCI format 1_0/1_1), a wireless device mayactivate a third BWP indicated by the BWP indicator as a second activeBWP in response to the second field of the second DCI being a firstvalue (e.g., “1” in case of one bit).

In an example, when receiving the second DCI with the second DCI format(e.g., different from DCI format 1_0/1_1), a wireless device maydeactivate an active BWP indicated by the BWP indicator in response tothe second field of the second DCI being a second value (e.g., “0” incase of one bit).

In an example, a gNB may transmit one or more messages comprisingconfiguration parameters of a plurality of cells. In an example, atleast one cell of the plurality of cells may comprise a plurality ofBWPs comprising a default BWP. In an example, the configurationparameters may further indicate that the at least one cell may beassociated with a BWP timer and a timer value. In an example, a firsttimer value associated with a first cell of the at least one cell may besame as or different from a second timer value associated with a secondcell of the at least one cell.

In an example, a gNB may transmit a PDCCH on a first active BWP to awireless device. In an example, the wireless device may start the BWPtimer (e.g., BWP inactivity timer) with the timer value in response toreceiving the PDCCH on the first active BWP.

In an example, when cross-carrier scheduling is supported, a gNB maytransmit a first DCI via a PDCCH on a first active BWP of a first cell,of the at least one cell, for scheduling a second BWP of a second activecell of the at least one cell. In an example, the wireless device maytransit the second BWP of the second cell from inactive state to activestate, if the second BWP is in inactive state before receiving the firstDCI. In an example, the wireless device may start/restart a first BWPtimer with the timer value associated with the first cell (or the firstactive BWP) in response to receiving the first DCI. In an example, thewireless device may start/restart a second BWP timer with the time valueassociated with the second cell (or the second BWP) in response toreceiving the first DCI on the first active BWP.

In an example, the gNB and/or the UE may switch to the default BWP as anactive BWP in response to an expiry of the BWP timer associated to theat least one cell.

Existing BWP and CA operation mechanisms may allow at most one activeBWP in a cell. The cell may be associated with a BWP timer with a timervalue. In an example, a wireless device may start the BWP timer with thetimer value in response to receiving a first DCI on a first BWP (e.g.,active BWP). In an example, the wireless device may switch to a secondBWP in response to receiving the first DCI for BWP switching from thefirst BWP to the second BWP. In an example, the wireless device maystart/restart the BWP timer with the timer value in response to the BWPswitching. In an example, existing BWP operation mechanism may notsupport multiple active BWPs in a cell. Existing BWP and CA operationmechanisms may not efficiently manage a state (e.g., active state orinactive state) of multiple active BWPs, when multiple active BWPs aresupported. Existing BWP and CA operation mechanisms may not efficientlymanage a state (e.g., active state or inactive state) of multiple activeBWPs, when multiple active BWPs are supported, and/or when multiple BWPtimer are associated with the multiple active BWPs. Example embodimentsmay provide efficient BWP operation mechanism for supporting multipleactive BWPs operation in a cell. Example embodiments may provideefficient BWP timer management for supporting multiple active BWPsoperation in a cell.

In an example, a gNB and/a wireless device may communicate on multipleactive BWPs of a plurality of BWPs for transmitting/receiving multipletypes of services, in a cell. In an example, each of the plurality ofBWPs may be in one of active state and inactive state. In an example,the plurality BWPs may comprise a default BWP. In an example, thedefault BWP may be in inactive state if the default BWP is differentfrom one or more of the multiple active BWPs. In an example, a wirelessdevice may switch a first active BWP of the multiple active BWPs to thedefault BWP in response to at least one of: receiving a DCI for BWPswitching to the default BWP; a first BWP timer associated with thefirst active BWP expiring. In an example, a wireless device may switch asecond active BWP of the multiple active BWPs to the default BWP inresponse to at least one of: receiving a DCI for BWP switching to thedefault BWP; a second BWP timer associated with the second active BWPexpiring. In an example, the first inactivity timer may be associatedwith a first timer value. In an example, the second inactivity timer maybe associated with a second timer value.

In an example, a gNB may transmit one or more messages comprisingconfiguration parameters indicating a cell comprising a default BWPand/or a plurality of BWPs. In example, the configuration parameters mayfurther indicate each of the plurality of BWPs may be associated with aBWP specific timer and a BWP timer value. In an example, a first BWPtimer value of a first BWP of the plurality of BWPs may be differentfrom a second BWP timer value of a second BWP of the plurality of BWPs.In example, the configuration parameters may further indicate each ofthe plurality of BWPs may be associated with a BWP specific timer and acell timer value. In an example, the BWP timers of the plurality of BWPsmay be associated with the same cell timer value.

In an example, a gNB may transmit one or more messages comprisingconfiguration parameters indicating a cell comprising a default BWPand/or a plurality of BWP groups. In example, the configurationparameters may further indicate each BWP group of the plurality of BWPgroups may be associated with a BWP group specific timer and a BWP grouptimer value.

In an example, a wireless device may receive a first DCI via a firstPDCCH on a first BWP of the plurality of BWPs. In an example, thewireless device start/restart a first BWP specific timer with a firstBWP (or the cell) timer value in response to receiving the first DCI onthe first BWP. In an example, a wireless device may receive a second DCIvia a second PDCCH on a second BWP of the plurality of BWPs. In anexample, the wireless device start/restart a second BWP specific timerwith a second BWP (or the cell) timer value in response to receiving thesecond DCI on the second BWP. In an example, the wireless device maymanage the first BWP specific timer of the first BWP and the second BWPspecific timer of the second BWP independently.

In an example, the wireless device start/restart a first BWP groupspecific timer with a first BWP group (or the cell) timer value inresponse to receiving a DCI on a first BWP of a first BWP group of theplurality of BWP groups. In an example, the wireless devicestart/restart a second BWP group specific timer with a second BWP group(or the cell) timer value in response to receiving a DCI on a second BWPof a second BWP group of the plurality of BWP groups. In an example, thewireless device may manage the first BWP group specific timer of thefirst BWP group and the second BWP group specific timer of the secondBWP group independently.

In an example, a gNB may transmit one or more messages comprisingconfiguration parameters indicating a cell comprising a primary activeBWP and a plurality of BWPs in a cell. In example, the configurationparameters may further indicate each of the plurality of BWPs may beassociated with a BWP specific timer and a BWP timer value or a cellspecific timer value. In an example, the primary active BWP may remainin active state until receiving a second command indicating a primaryactive BWP switching. In an example, the second command may be an RRCmessage, a MAC CE, and/or a DCI (e.g., DCI indicating a primary activeBWP switching). In an example, the primary active BWP may not beassociated with a BWP specific timer. In an example, the wireless devicemay manage a first BWP specific timer of a first BWP of the plurality ofBWPs and the second BWP specific timer of a second BWP of the pluralityof BWPs independently and keep the primary active BWP active untilreceiving the second command.

In an example, a gNB may transmit a first DCI on a first BWP (e.g., afirst DL BWP) of the plurality of BWPs indicating a DL assignment or anUL grant for a second BWP of the plurality of BWPs. In an example, thefirst BWP may be associated with a first BWP specific timer with a firstBWP timer value (or a cell timer value). In an example, the first BWPmay be a primary active BWP. In an example, the second BWP may beassociated with a second BWP specific timer with a second BWP timervalue (or a cell timer value). In an example, the wireless device maystart/restart the first BWP specific timer with the first BWP timervalue (or the cell timer value) in response to receiving the first DCI.In an example, the wireless device may start/restart the second BWPspecific timer with the second BWP timer value (or the cell timer value)in response to receiving the first DCI.

In an example, the first DCI transmitted on the first BWP may indicate aconfigured (or dynamic) downlink assignment on the second BWP (e.g., asecond DL BWP). In an example, the first DCI transmitted on the firstBWP may indicate a configured (or dynamic) uplink grant on the secondBWP (e.g., an UL BWP). In an example, the first DCI transmitted on thefirst BWP may be transmitted via a PDCCH addressed to a first identifieron the first BWP. In an example, the first identifier may be one ofC-RNTI and CS-RNTI. In an example, the first identifier may be one ofSI-RNTI, RA-RNTI or a TC-RNTI, or P-RNTI, or INT-RNTI, or SFI-RNTI, orTPC-PUSCH-RNTI, or TPC-PUCCH-RNTI, or TPC-SRS-RNTI, or CS-RNTI, orSP-CSI-RNTI, or C-RNTI.

In an example, a gNB may transmit a second DCI (or a MAC CE) on a firstBWP of the plurality of BWPs indicating activating a second BWP of theplurality of BWPs. In an example, the first BWP may be associated with afirst BWP specific timer with a first BWP timer value (or a cell timervalue). In an example, the first BWP may be a primary active BWP. In anexample, the second BWP may be associated with a second BWP specifictimer with a second BWP timer value (or a cell timer value). In anexample, the wireless device may start/restart the first BWP specifictimer with the first BWP timer value (or the cell timer value) inresponse to receiving the second DCI. In an example, the wireless devicemay activate the second BWP in response to receiving the second DCI. Inan example, the wireless device may start/restart the second BWPspecific timer with the second BWP timer value (or the cell timer value)in response to the activating the second BWP. In an example, a gapbetween a first time when a DCI for the activation is received and asecond time when the activation is completed may be zero or a valuegreater than zero.

In an example, a gNB may transmit a third DCI (or a MAC CE) on a firstBWP of the plurality of BWPs indicating deactivating a second BWP of theplurality of BWPs. In an example, the first BWP may be associated with afirst BWP specific timer with a first BWP timer value (or a cell timervalue). In an example, the first BWP may be a primary active BWP. In anexample, the second BWP may be associated with a second BWP specifictimer with a second BWP timer value (or a cell timer value). In anexample, the wireless device may not start/restart the first BWPspecific timer with the first BWP timer value (or the cell timer value)in response to receiving the second DCI. In an example, the wirelessdevice may deactivate the second BWP in response to receiving the secondDCI. In an example, the wireless device may reset the second BWPspecific timer to the second BWP specific timer value (or the cellspecific timer value) and/or not start the second BWP specific timer inresponse to the deactivating the second BWP.

In an example, a gNB may transmit a fourth DCI on a first active BWP ofthe plurality of BWPs indicating switching from a second active BWP to athird BWP as a third active BWP. In an example, the first active BWP maybe associated with a first BWP specific timer with a first BWP timervalue (or a cell timer value). In an example, the first BWP may be aprimary active BWP. In an example, the second active BWP may beassociated with a second BWP specific timer with a second BWP timervalue (or a cell timer value). In an example, the third BWP may beassociated with a third BWP specific timer with a third BWP timer value(or a cell timer value). In an example, the wireless device maystart/restart the first BWP specific timer with the first BWP timervalue (or the cell timer value) in response to receiving the fourth DCI.In an example, the wireless device may deactivate the second active BWPand activate the third BWP as the third active BWP at a time in responseto receiving the fourth DCI. In an example, the wireless device mayreset the second BWP specific timer to the second BWP timer value (orthe cell timer value) and/or not start the second BWP specific timer inresponse to the deactivating the second active BWP. In an example, thewireless device may start/restart the third BWP specific timer with thethird BWP timer value (or the cell timer value) in response to theactivating the third BWP. In an example, a gap between a first time whena DCI for the switching is received and a second time when the switchingis completed may be zero or a value greater than zero.

In an example, a gNB may transmit one or more messages comprisingconfiguration parameters indicating a cell comprising a default BWP anda plurality of BWPs in a cell. In example, the configuration parametersmay further indicate each of the plurality of BWPs may be associatedwith a BWP specific timer and a BWP timer value or a cell timer value.In an example, a first active BWP of multiple active BWPs of theplurality of BWPs may be designated as a primary active BWP (PBWP). Inan example, at least a second active BWP of multiple active BWPs of theplurality of BWPs may be designated as a secondary active BWP (SBWP). Inan example, the default BWP may be in inactive state when the defaultBWP is different from the PBWP.

In an example, a wireless device may start/restart a first BWP specifictimer in response to receiving a first command indicating at least oneof: the PBWP being activated; a PBWP switching; and/or DL assignment/ULgrant on the PBWP. In an example, the wireless device may start/restarta second BWP specific timer in response to receiving a second commandindicating at least one of: the SBWP being activated; a SBWP switching;and DL assignment/UL grant on the SBWP.

In an example, the wireless device may monitor a first PDCCH on the PBWPin response to the first BWP specific timer is running. In an example,the wireless device may monitor a second PDCCH on the SBWP in responseto the second BWP specific timer is running.

In an example, the wireless device may deactivate the SBWP in responseto the second BWP specific timer expiring and the first BWP specifictimer being running. In an example, the wireless device may keep thePBWP in active state in response to the second BWP specific timerexpiring and the first BWP specific timer being running. In an example,the wireless device may keep the default BWP in inactive state inresponse to the second BWP specific timer expiring and the first BWPspecific timer being running.

In an example, the wireless device may switch from the PBWP to thedefault BWP in response to the second BWP specific timer expiring andthe first BWP specific timer expiring. In an example, the wirelessdevice may switch from the PBWP to the default BWP in response to one ormore BWP specific timers expiring. In an example, the one or more BWPspecific timers may comprise at least the second BWP specific timer andthe first BWP specific timer. In an example, the wireless device mayactivate the default BWP and deactivate the PBWP at a time, in responseto the switching. In an example, a gap between a first time when theswitching is started and a second time when the switching is completedmay be zero or a value greater than zero.

In an example, a gNB may transmit one or more messages comprisingconfiguration parameters indicating a cell comprising a default BWP anda plurality of BWPs in a cell. In example, the configuration parametersmay further indicate each of the plurality of BWPs may be associatedwith a BWP specific timer and a BWP timer value or a cell timer value.In an example, a first active BWP of multiple active BWPs of theplurality of BWPs may be designated as a primary active BWP (PBWP). Inan example, at least a second active BWP of multiple active BWPs of theplurality of BWPs may be designated as a secondary active BWP (SBWP). Inan example, the default BWP may be in inactive state when the defaultBWP is different from the PBWP. In an example, the SBWP may be notconfigured with a PDCCH. In an example, a gNB may transmit a downlinkscheduling or an uplink grant for the SBWP via a PDCCH on the PBWP. Inan example, the SBWP may be not associated with a BWP specific timer,e.g. when the SBWP is not configured with a PDCCH on the SBWP.

In an example, a wireless device may start/restart a first BWP specifictimer in response to receiving a first command indicating at least oneof: the PBWP being activated; a PBWP switching; and DL assignment/ULgrant on the PBWP. In an example, the wireless device may start/restarta second BWP specific timer (if configured) in response to receiving asecond command indicating at least one of: the SBWP being activated; aSBWP switching; and DL assignment/UL grant on the SBWP.

In an example, the wireless device may monitor a first PDCCH on the PBWPin response to the first BWP specific timer is running. In an example,the wireless device may monitor the first PDCCH or a second PDCCH on thePBWP for the SBWP in response to the second BWP specific timer isrunning.

In an example, the wireless device may switch from the PBWP to thedefault BWP in response to the first BWP specific timer expiring and/orthe second BWP specific timer (if configured) being running. In anexample, the wireless device may deactivate the PBWP and activate thedefault BWP at a time in response to the switching. In an example, thewireless device may deactivate the SBWP in response to the switching. Inan example, a gap between a first time when the switching is started anda second time when the switching is completed may be zero or a valuegreater than zero.

In an example, a gNB may transmit one or more messages comprisingconfiguration parameters indicating a cell comprising a default BWP anda plurality of BWPs in a cell. In example, the configuration parametersmay further indicate each of the plurality of BWPs may be associatedwith a BWP specific timer and a BWP timer value or a cell timer value.

In an example, a wireless device may start/restart a first BWP specifictimer in response to receiving a first command indicating at least oneof: a first BWP being activated and/or DL assignment/UL grant on thefirst BWP. In an example, the wireless device may start/restart a secondBWP specific timer (if configured) in response to receiving a secondcommand indicating at least one of: a second BWP being activated and/orDL assignment/UL grant on the second BWP.

In an example, the wireless device may monitor a first PDCCH on thefirst BWP in response to the first BWP specific timer is running. In anexample, the wireless device may monitor a second PDCCH on the secondBWP in response to the second BWP specific timer is running.

In an example, the wireless device may switch from the second BWP to thedefault BWP in response to the second BWP specific timer expiring and/orthe first BWP specific timer being running. In an example, the wirelessdevice may deactivate the second BWP and activate the default BWP at atime in response to the switching. In an example, the wireless devicemay keep the first BWP in active state in response to the switching. Inan example, a gap between a first time when the switching is started anda second time when the switching is completed may be zero or a valuegreater than zero. In an example, the wireless device may deactivate thefirst BWP and keep the default BWP in active state in response to one ormore BWP specific timers expiring. In an example, the one or more BWPspecific timers may comprise at least: the first BWP specific timer; andthe second BWP specific timer.

In an example, a gNB may transmit one or more messages comprisingconfiguration parameters indicating a cell comprising a default BWP anda plurality of BWPs in a cell. In example, the configuration parametersmay further indicate each of the plurality of BWPs being associated witha BWP specific timer and a BWP timer value or a cell timer value.

In an example, a wireless device may start/restart a first BWP specifictimer in response to receiving a first command indicating at least oneof: a first BWP being activated and/or DL assignment/UL grant on thefirst BWP. In an example, the wireless device may start/restart a secondBWP specific timer (if configured) in response to receiving a secondcommand indicating at least one of: a second BWP being activated and/orDL assignment/UL grant on the second BWP.

In an example, the wireless device may monitor a first PDCCH on thefirst BWP in response to the first BWP specific timer is running. In anexample, the wireless device may monitor a second PDCCH on the secondBWP in response to the second BWP specific timer is running.

In an example, the wireless device may deactivate the second BWP inresponse to the second BWP specific timer expiring and/or the first BWPspecific timer being running. In an example, the wireless device maydeactivate the second BWP in response to the switching. In an example,the wireless device may keep the first BWP in active state in responseto the switching. In an example, a gap between a first time when theswitching is started and a second time when the switching is completedmay be zero or a value greater than zero.

In an example, the wireless device may switch to the default BWP inresponse to one or more BWP specific timers expiring. In an example, theone or more BWP specific timers may comprise at least: the first BWPspecific timer; and the second BWP specific timer. In an example, thewireless device may deactivate the first BWP or the second BWP andactivate the default BWP in a time in response to the switching.

In an example, a gNB and a wireless device may align multiple BWP timerswhen multiple active BWPs are supported, by one or more of theembodiments. In an example, a wireless device may reduce powerconsumption when multiple active BWPs are supported, by one or more ofthe embodiments. In an example, a gNB may reduce signaling overhead tomaintain time alignments or synchronization on multiple active BWPs, byone or more of the embodiments.

In an example, at least two wireless devices may operate on a firstuplink BWP of a cell. In an example, the at least two wireless devicesmay operate on different downlink BWPs of the cell. In an example, whena base station receives a random access preamble of a random accessprocedure (e.g., contention-based) via the first uplink BWP, the basestation may not identify an identity of a wireless device of the atleast two wireless devices transmitting the random access preamble. Inresponse to the not identifying, the base station may not determine onwhich downlink BWP to transmit a random access response.

In an example, the base station may transmit the random access procedureon the different downlink BWPs. This may result in waste of resources,signaling overhead.

In an example, the wireless device of the at least two wireless devicesinitiating the random access procedure may switch to a downlink BWP toreceive the random access response. The base station may transmit therandom access response on the switched downlink BWP. In an example, theswitching may enable the base station to transmit the random accessresponse of the random access procedure on a single downlink BWP. Thismay reduce a number of random access responses transmitted by the basestation. In an example, the switching may be based on a linkage betweena first uplink BWP specific index of the first uplink BWP and a downlinkBWP specific index of the downlink BWP. In an example, the base stationand the wireless device may be aware of the linkage. In an example, thelinkage may be configured by higher layers (e.g., RRC).

FIG. 24A and FIG. 24B show examples of an existing random-accessprocedure.

In an example, a wireless device may receive, from a base station, oneor more messages (e.g. RRC connection reconfiguration message, or RRCconnection reestablishment message, or RRC connection setup message)comprising configuration parameters for a cell (e.g., PCell, PSCell,SCell). In an example, the configuration parameters may comprisebandwidth part (BWP) configuration parameters for a plurality ofdownlink BWPs of the cell and a plurality of uplink BWPs of the cell (attime T0 in FIG. 24B).

In an example, the wireless device may operate in a paired spectrum(e.g., frequency division duplex (FDD)).

In an example, in FIG. 24A, the plurality of downlink BWPs may compriseFirst DL-BWP, Second DL-BWP, and Third DL-BWP. The plurality of uplinkBWPs may comprise First UL-BWP, Second UL-BWP, and Third UL-BWP.

In an example, the plurality of downlink BWPs may comprise a firstdownlink BWP (e.g., the First DL-BWP in FIG. 24A). In an example, theplurality of uplink BWPs may comprise a second uplink BWP (e.g., theSecond UL-BWP in FIG. 24A).

In an example, the configuration parameters may further comprisedownlink BWP specific indices for the plurality of downlink BWPs and/oruplink BWP specific indices for the plurality of uplink BWPs. In anexample, each downlink BWP of the plurality of downlink BWPs may beidentified by a respective one downlink BWP specific index of thedownlink BWP specific indices (e.g., provided by a higher layerparameter bwp-ID). In an example, each uplink BWP of the plurality ofuplink BWPs may be identified by a respective one uplink BWP specificindex of the uplink BWP specific indices (e.g., provided by a higherlayer parameter bwp-ID).

In an example, the second uplink BWP may be identified by a seconduplink BWP specific index. The first downlink BWP may be identified by afirst downlink BWP specific index.

In an example, at a time slot (e.g., between time T0 and time T1 in FIG.24B), the wireless device may operate on the first downlink BWP and thesecond uplink BWP of the cell. In response to the operating, thewireless device may be, at the time slot, active on the first downlinkBWP and the second uplink BWP. In an example, at the time slot, thefirst downlink BWP and the second uplink BWP may be an active downlinkBWP and an active uplink BWP of the cell, respectively in response tothe operating.

In an example, when the first downlink BWP is the active downlink BWPand the second uplink BWP is the active uplink BWP of the cell (e.g., atthe time slot), the wireless device may initiate a random-accessprocedure (e.g., contention-based random-access procedure,contention-free random-access procedure) at time T1 in FIG. 24B.

In an example, the random-access procedure may be initiated for aninitial access from RRC_IDLE, an RRC Connection Re-establishmentprocedure, a handover, a DL or UL data arrival during RRC_CONNECTED whenUL synchronization status is “non-synchronized”, a transition fromRRC_INACTIVE, a time alignment establishment at SCell addition, a beamfailure recovery, or a request for other system information (SI).

In an example, the configuration parameters may not comprise one or morePRACH occasions on the second uplink BWP. In an example, when thewireless device initiates the random-access procedure via the seconduplink BWP, in response to the one or more PRACH occasions not beingconfigured on the second uplink BWP, the wireless device may switch fromthe second uplink BWP to an initial uplink BWP (e.g., indicated by RRCparameter initialUplinkBWP) of the cell. In an example, the cell may notbe an SpCell (e.g., PCell, PSCell). In an example, the cell may be asecondary cell (e.g., SCell). In an example, when the cell is not anSpCell, in response to the switching from the second uplink BWP to theinitial uplink BWP, the wireless device may perform the random-accessprocedure on the initial uplink BWP of the cell and a second activedownlink BWP of an SpCell.

In an example, the configuration parameters may not comprise one or morePRACH occasions on the second uplink BWP. In an example, when thewireless device initiates the random-access procedure via the seconduplink BWP, in response to the one or more PRACH occasions not beingconfigured on the second uplink BWP, the wireless device may switch fromthe second uplink BWP to an initial uplink BWP (e.g., indicated by RRCparameter initialUplinkBWP) of the cell. In an example, the cell may bean SpCell (e.g., PCell, PSCell). In an example, when the wireless deviceinitiates the random-access procedure via the second uplink BWP, inresponse to the cell being the SpCell and the one or more PRACHoccasions not being configured on the second uplink BWP, the wirelessdevice may switch from the first downlink BWP to an initial downlink BWP(e.g., indicated RRC parameter by initialDownlinkBWP) of the cell. In anexample, in response to the switching from the first downlink BWP, thewireless device may perform the random-access procedure on the initialuplink BWP of the cell and the initial downlink BWP of the cell.

In an example, the configuration parameters may comprise one or morePRACH occasions on the second uplink BWP. In an example, the cell maynot be an SpCell (e.g., PCell, PSCell). In an example, the cell may be asecondary cell (e.g., SCell). In an example, when the wireless deviceinitiates the random-access procedure, the wireless device may performthe random-access procedure on the second uplink BWP (e.g., via the oneor more PRACH resources) of the cell and a second active downlink BWP ofa second cell (e.g., SpCell).

In an example, the configuration parameters may comprise one or morePRACH occasions on the second uplink BWP. In an example, the firstdownlink BWP specific index and the second uplink BWP specific index maybe the same. In an example, the cell may be an SpCell (e.g., PCell,PSCell). In an example, when the wireless device initiates therandom-access procedure, in response to the first downlink BWP specificindex and the second uplink BWP specific index being the same, thewireless device may perform the random-access procedure on the firstdownlink BWP and the second uplink BWP (e.g., via the one or more PRACHresources) of the cell (e.g., SpCell).

In an example, the configuration parameters may comprise one or morePRACH occasions on the second uplink BWP. In an example, the firstdownlink BWP specific index may be different from the second uplink BWPspecific index. In an example, the cell may be an SpCell (e.g., PCell,PSCell). In an example, when the wireless device initiates therandom-access procedure, in response to the first downlink BWP specificindex being different from the second uplink BWP specific index, thewireless device may switch from the first downlink BWP to a seconddownlink BWP (e.g., the Second DL-BWP in FIG. 24A) of the plurality ofdownlink BWPs of the cell (e.g., SpCell). In an example, the seconddownlink BWP may be identified by a second downlink BWP specific index.The second downlink BWP specific index and second uplink BWP specificindex may be the same. In response to the switching from the firstdownlink BWP to the second downlink BWP, the wireless device may performthe random-access procedure on the second downlink BWP of the cell andthe second uplink BWP (e.g., via the one or more PRACH resources) of thecell.

In an example, the wireless device may perform the random-accessprocedure on the second downlink BWP (e.g., the Second DL-BWP in FIG.24A) and the second uplink BWP (e.g., the Second UL-BWP in FIG. 24A) ofthe cell. The second downlink BWP specific index and the second uplinkBWP specific index may be the same.

FIG. 25 shows an example flowchart of BWP switching for a random-accessprocedure.

In an example, the configuration parameters may comprise one or morePRACH resources on the second uplink BWP. In an example, theconfiguration parameters may comprise one or more RSs (e.g., SSB,CSI-RS). In an example, the configuration parameters may furthercomprise an association (or correspondence) between the one or more RSsand the one or more PRACH resources (e.g., the association may beone-to-one, one-to-many, many-to-one, etc.). The association may beprovided by configuration parameters (e.g., RACH-ConfigDedicated,CandidateBeamRSList, RACH-ConfigCommon, ra-ssb-OccasionMaskIndex,ra-OccasionList etc.).

In an example, the performing the random-access procedure on the seconduplink BWP may comprise performing a random-access resource selection onthe second uplink BWP. In an example, the performing the random-accessresource selection may comprise selecting a first RS in the one or moreRSs. The first RS may be a first SSB or a first CSI-RS. In an example,the first RS may be associated with (or corresponding to) a PRACHresource of the one or more PRACH resources configured on the seconduplink BWP. The PRACH resource may comprise at least one preamble(associated with PREAMBLE_INDEX) and at least one PRACH occasion (e.g.,time, frequency, code) on the second uplink BWP.

In an example, in response to the performing the random-access resourceselection, the wireless device may perform a random-access preambletransmission. In an example, in the random-access preamble transmission,the wireless device may transmit, in a first slot, the at least onepreamble via the at least one PRACH resource of the second uplink BWPfor the random-access procedure (at time T2 in FIG. 24B).

In an example, in response to transmitting the at least one preamble inthe first slot, the wireless device may start, from a second slot, aconfigured response window (e.g., ra-responseWindow). In an example, theconfigured response window may be configured by the configurationparameters (e.g., RACH-ConfigCommon, BeamFailureRecoveryConfig).

In an example, when the configured response window is running, thewireless device may monitor for a random-access response (RAR). Themonitoring for the random-access response may comprise monitoring, for aDCI (e.g. a downlink assignment, an uplink grant), at least one PDCCH inthe second downlink BWP of the cell (e.g., SpCell).

In an example, the DCI may be identified with CRC scrambled by a C-RNTIor MCS-C-RNTI of the wireless device in response the random-accessprocedure being initiated for a beam failure recovery of the cell.

In an example, the DCI may be identified with CRC scrambled by aRA-RNTI.

In an example, an offset between the first slot and the second slot maybe fixed. In an example, the offset may be 4 slots.

In an example, the second slot may be at a first PDCCH occasion of thesecond downlink BWP from the end of the transmitting the at least onepreamble.

In an example, when the random-access procedure is initiated for a beamfailure recovery, in response to receiving the DCI (e.g., scrambled byC-RNTI or MCS-C-RNTI) on the at least one PDCCH in the second downlinkBWP of the cell, within the configured response window, therandom-access procedure (e.g., contention-free random-access procedure)for the beam failure recovery may be successfully completed (time T3 inFIG. 24B).

In an example, the random-access response may comprise a first MACsubPDU with a random-access preamble identifier. In an example, therandom-access preamble identifier may be associated with (orcorresponding to) the at least one preamble (e.g., PREAMBLE_INDEX).

In an example, when the random-access procedure is not initiated for abeam failure recovery (e.g., contention-free random-access procedure forthe beam failure recovery), in response to receiving the DCI (e.g.,scrambled by RA-RNTI) in the at least one PDCCH of the second downlinkBWP of the cell, within the configured response window, and therandom-access preamble identifier being associated with (orcorresponding to) the at least one preamble, a reception of therandom-access response may be successfully completed (time T3 in FIG.24B).

In an example, when the random-access procedure is not initiated for abeam failure recovery and a reception of the random-access response issuccessfully completed, in response to receiving the DCI (e.g.,scrambled by RA-RNTI) on the at least one PDCCH in the second downlinkBWP of the cell, within the configured response window, therandom-access procedure (e.g., contention-free random-access procedure)may be successfully completed (time T3 in FIG. 24B).

In an example, the random-access response may comprise a second MACsubPDU with a back-off indicator. In an example, in response to therandom-access response comprising the second MAC subPDU with theback-off indicator, the wireless device may set a preamble back-offvariable (e.g., PREAMBLE_BACKOFF) to a value indicated by the back-offindicator.

In an example, the random-access response may not comprise a second MACsubPDU with a back-off indicator. In an example, in response to therandom-access response not comprising the second MAC subPDU with theback-off indicator, the wireless device may set a preamble back-offvariable (e.g., PREAMBLE_BACKOFF) to a value (e.g., 0 ms). The value maybe fixed/predefined.

In an example, the configured response window may expire. In an example,the wireless device may not receive the DCI within the configuredresponse window. In response to the configured response window expiringand the wireless device not receiving the DCI (e.g., scrambled byC-RNTI) or a random-access response comprising the random-accesspreamble identifier being associated with (or corresponding to) the atleast one preamble, the wireless device may consider a reception of therandom-access response unsuccessful and may increment a preambletransmission counter variable (e.g., PREAMBLE_TRANSMISSION_COUNTER) byone.

In an example, in response to the incrementing, the preambletransmission counter variable may be equal to or greater than a preamblemaximum transmission parameter (e.g., RRC parameter preambleTransMax).

In an example, the cell may be an SpCell (e.g., PCell, PSCell). In anexample, the wireless device may transmit the at least one preamble onthe SpCell in response to the cell being the SpCell. In an example, thewireless device may indicate a problem of the random-access procedure toupper layers (e.g., RRC) in response to the preamble transmissioncounter variable being equal to or greater than the preamble maximumtransmission parameter.

In an example, the cell may be an SCell. In an example, the wirelessdevice may transmit the at least one preamble on the SCell in responseto the cell being the SCell. In an example, the wireless device maycomplete the random-access procedure unsuccessfully in response to thepreamble transmission counter variable being equal to or greater thanthe preamble maximum transmission parameter.

In an example, in response to the indicating the problem of therandom-access procedure to the upper layers (e.g., RRC), the upperlayers may trigger a radio link failure that may lead to prolongedrandom-access delay and degraded user experience.

In an example, in response to the incrementing, the preambletransmission counter variable may be less than the preamble maximumtransmission parameter plus one. In response to the preambletransmission counter variable being less than the preamble maximumtransmission parameter plus one, the wireless device may consider therandom-access procedure incomplete.

In an example, in response to the considering the random-accessprocedure incomplete, the wireless device may select a random back-offtime. The random back-off time may be selected according to a uniformdistribution between zero and the preamble back-off variable. In anexample, the wireless device may start a back-off timer with a valueindicated by the random back-off time in response to the selecting.

In an example, while the back-off timer is running, the wireless devicemay perform a second random-access resource selection. The wirelessdevice may select a second RS in the one or more RSs. In an example, thesecond RS may be a second SSB or a second CSI-RS. In an example, thesecond RS may be associated with (or corresponding to) a second PRACHresource of the one or more PRACH resources configured on the seconduplink BWP. The second PRACH resource may comprise at least one secondpreamble and at least one second PRACH occasion (e.g., time, frequency,code) on the second uplink BWP. In an example, the second PRACH resourcemay be a contention-free random-access resource (e.g., provided by RRCor PDCCH order). In response to the second PRACH resource being thecontention-free random-access resource, the wireless device may stop theback-off timer and perform a second random-access preamble transmission.In an example, in the second random-access preamble transmission, thewireless device may transmit, in a third slot, the at least one secondpreamble via the at least one second PRACH resource of the second uplinkBWP for the random-access procedure.

In an example, while the back-off timer is running, the wireless devicemay perform a second random-access resource selection. The wirelessdevice may not find/select at least one RS in the one or more RSsassociated with (or corresponding to) a contention-free random-accessresource (e.g., provided by RRC or PDCCH order) until the back-off timerexpires. In response to the not finding/selecting the at least one RS inthe one or more RSs associated with the contention-free random-accessresource, the wireless device may perform a third random-access resourceselection in response to the back-off timer expiring. The thirdrandom-access resource selection may be different from the secondrandom-access resource selection.

In an example, the wireless device may perform a contention-resolutiontransmission. The performing the contention-resolution transmission maycomprise transmitting a third message (e.g., Msg3) via the second uplinkBWP at time T4 in FIG. 24B, in response to the reception of therandom-access response being successfully completed (time T3 in FIG.24B). In an example, the wireless device may start a contentionresolution timer (e.g., ra-ContentionResolutionTimer) in response to thetransmitting the third message.

In an example, when the contention resolution timer is running, thewireless device may monitor, for a second DCI (e.g. Msg4, a downlinkassignment, an uplink grant), at least one second PDCCH in the seconddownlink BWP of the cell (e.g., SpCell).

In an example, the second DCI may be identified with CRC scrambled by aC-RNTI.

In an example, the second DCI may be identified with CRC scrambled by aTEMPORARY_C-RNTI.

In an example, in response to receiving the second DCI (e.g., scrambledby C-RNTI, TEMPORARY_C-RNTI) in the at least one second PDCCH in thesecond downlink BWP of the cell while the contention resolution timer isrunning, the contention-resolution transmission may be successfullycompleted (time T5 in FIG. 24B). In response to thecontention-resolution transmission being successfully completed, thewireless device may stop the contention resolution timer.

In an example, in response to receiving the second DCI in the at leastone second PDCCH in the second downlink BWP of the cell while thecontention resolution timer is running, the random-access procedure maybe successfully completed.

In an example, contention resolution timer may expire. In an example,the wireless device may not receive the second DCI while the contentionresolution timer is running. In response to the contention resolutiontimer expiring and the wireless device not receiving the second DCI, thewireless device may increment a preamble transmission counter variable(e.g., PREAMBLE_TRANSMISSION_COUNTER) by one.

In an example, in response to the incrementing, the preambletransmission counter variable may be equal to or greater than a preamblemaximum transmission parameter (e.g., RRC parameter preambleTransMax)(e.g., preambleTransMax+1).

In an example, the cell may be an SpCell (e.g., PCell, PSCell). In anexample, the wireless device may indicate a problem of the random-accessprocedure to upper layers (e.g., RRC) in response to the preambletransmission counter variable being equal to or greater than thepreamble maximum transmission parameter.

In an example, in response to the incrementing, the preambletransmission counter variable may be less than the preamble maximumtransmission parameter plus one. In response to the preambletransmission counter variable being less than the preamble maximumtransmission parameter plus one, the wireless device may consider therandom-access procedure incomplete.

In an example, in response to the considering the random-accessprocedure incomplete, the wireless device may select a random back-offtime. The random back-off time may be selected according to a uniformdistribution between zero and the preamble back-off variable. In anexample, the wireless device may start a back-off timer with a valueindicated by the random back-off time in response to the selecting.

In an example, while the back-off timer is running, the wireless devicemay perform a second random-access resource selection. The wirelessdevice may select a second RS in the one or more RSs. In an example, thesecond RS may be a second SSB or a second CSI-RS. In an example, thesecond RS may be associated with (or corresponding to) a second PRACHresource of the one or more PRACH resources configured on the seconduplink BWP. The second PRACH resource may comprise at least one secondpreamble and at least one second PRACH occasion (e.g., time, frequency,code) on the second uplink BWP. In an example, the second PRACH resourcemay be a contention-free random-access resource (e.g., provided by RRCor PDCCH order). In response to the second PRACH resource being thecontention-free random-access resource, the wireless device may stop theback-off timer and perform a second random-access preamble transmission.In an example, in the second random-access preamble transmission, thewireless device may transmit the at least one second preamble via the atleast one second PRACH resource of the second uplink BWP for therandom-access procedure.

In an example, while the back-off timer is running, the wireless devicemay perform a second random-access resource selection. The wirelessdevice may not find/select at least one RS in the one or more RSsassociated with a contention-free random-access resource (e.g., providedby RRC or PDCCH order) until the back-off timer expires. In response tothe not finding/selecting the at least one RS in the one or more RSsassociated with the contention-free random-access resource until theback-off timer expires, the wireless device may perform a thirdrandom-access resource selection (e.g., in response to the back-offtimer expiring). The third random-access resource selection may bedifferent from the second random-access resource selection.

FIG. 26A and FIG. 26B show examples of a random-access procedure as peran aspect of an embodiment of the present disclosure.

In an example, configuration parameters received at time T0 in FIG. 26Bare the same as the configuration parameters received at time T0 in FIG.24B.

In an example, the wireless device may support multiple active BWPs. Inan example, the wireless device may operate in a paired spectrum (e.g.,frequency division duplex (FDD)).

In an example, the plurality of downlink BWPs may comprise a firstdownlink BWP (e.g., the First DL-BWP in FIG. 26A), a second downlink BWP(e.g., the Second DL-BWP in FIG. 26A), a third downlink BWP (e.g., theThird DL-BWP in FIG. 26A). In an example, the plurality of uplink BWPsmay comprise a second uplink BWP (e.g., the Second UL-BWP in FIG. 26A)and a third uplink BWP (e.g., the Third UL-BWP in FIG. 26A).

In an example, the second uplink BWP and the third uplink BWP may beidentified by a second uplink BWP specific index and a third uplink BWPspecific index, respectively. The first downlink BWP, the seconddownlink BWP, and the third downlink BWP may be identified by a firstdownlink BWP specific index, a second downlink BWP specific index, and athird downlink BWP specific index, respectively.

In an example, at a time slot (e.g., between time T0 and time T1 in FIG.26B), the wireless device may operate on the first downlink BWP, thesecond uplink BWP and the third uplink BWP of the cell. In response tothe operating, the wireless device may be, at the time slot, active onthe first downlink BWP, the second uplink BWP and the third uplink BWP.In an example, at the time slot, the first downlink BWP, the seconduplink BWP and the third uplink BWP may be an active downlink BWP, afirst active uplink BWP and a second active uplink BWP of the cell,respectively in response to the operating. In an example, at the timeslot, one or more active uplink BWPs of the cell may be the first activeuplink BWP and the second active uplink BWP.

In an example, when the first downlink BWP is the active downlink BWP,the second uplink BWP is the first active uplink BWP and the thirduplink BWP is the second active uplink BWP of the cell (e.g., at thetime slot), the wireless device may initiate a random-access procedure(e.g., contention-based random-access procedure, contention-freerandom-access procedure) at time T1 in FIG. 26B.

In an example, the configuration parameters may comprise one or morefirst PRACH resources (or occasions) on the second uplink BWP and one ormore second PRACH resources (or occasions) on the third uplink BWP.

In an example, in an unlicensed band, in response to the initiating therandom-access procedure, the wireless device may perform alisten-before-talk (LBT) procedure for the cell on the one or moreactive uplink BWPs (e.g., Second UL-BWP and Third UL-BWP in FIG. 26A) ofthe cell. In an example, selecting an uplink BWP of the one or moreactive uplink BWPs to perform the random-access procedure may be basedon the LBT procedure. In an example, in the LBT procedure, the wirelessdevice may perform a BWP specific LBT on each active uplink BWP of theone or more active uplink BWPs.

In an example, the one or more active uplink BWPs may comprise one ormore PRACH occasions.

In an example, in the LBT procedure, the wireless device may perform afirst LBT on the second uplink BWP (e.g., the first active uplink BWP)and a second LBT on the third uplink BWP (e.g., the second active uplinkBWP).

In an example, the first LBT may be successful and the second LBT mayfail. In response to the first LBT being successful and the second LBTfailing, the wireless device may select the second uplink BWP to performthe random-access procedure.

In an example, the first LBT may fail and the second LBT may besuccessful. In response to the first LBT failing and the second LBTbeing successful, the wireless device may select the third uplink BWP toperform the random-access procedure.

In an example, the first LBT may be successful and the second LBT may besuccessful. In response to the first LBT being successful and the secondLBT being successful, the wireless device may select an uplink BWP ofthe one or more active uplink BWPs randomly and/or based on a criterion.In an example, the criterion may be based on the channel load metrics,LBT success rate, channel occupancy, load history of the uplink BWP,time/frequency locations (e.g., close to the initial uplink BWP), of theuplink BWP etc.

In an example, in response to the performing the LBT procedure, thewireless device may select the second uplink BWP to perform therandom-access procedure. In an example, the cell may be an SpCell (e.g.,PCell, PSCell). In an example, the first downlink BWP specific index maybe different from the second uplink BWP specific index. In an example,in response to the first downlink BWP specific index being differentfrom the second uplink BWP specific index, the wireless device mayswitch from the first downlink BWP to the second downlink BWP (e.g., theSecond DL-BWP in FIG. 26A) of the plurality of downlink BWPs of the cell(e.g., SpCell). In an example, the second downlink BWP specific indexand second uplink BWP specific index may be the same. In response to theswitching from the first downlink BWP to the second downlink BWP, thewireless device may perform the random-access procedure on the seconddownlink BWP of the cell and the second uplink BWP (e.g., via the one ormore first PRACH resources) of the cell.

In an example, the performing the random-access procedure may comprisetransmitting, in a first slot, at least one preamble via at least onePRACH resource of the second uplink BWP for the random-access procedure(at time T2 in FIG. 26B).

In an example, in response to transmitting the at least one preamble inthe first slot, the wireless device may start, from a second slot, aconfigured response window (e.g., ra-responseWindow).

In an example, when the configured response window is running, thewireless device may monitor for a random-access response (RAR). Themonitoring for the random-access response may comprise monitoring, for aDCI (e.g. a downlink assignment, an uplink grant), at least one PDCCH inthe second downlink BWP of the cell (e.g., SpCell).

In an example, the configured response window may expire. In an example,the wireless device may not receive the DCI within the configuredresponse window. In response to the configured response window expiringand the wireless device not receiving the DCI (e.g., scrambled byC-RNTI) or a random-access response comprising the random-accesspreamble identifier being associated with (or corresponding to) the atleast one preamble, the wireless device may consider a reception of therandom-access response unsuccessful and may increment a preambletransmission counter variable (e.g., PREAMBLE_TRANSMISSION_COUNTER) byone.

In an example, in response to the incrementing, the preambletransmission counter variable may be less than the preamble maximumtransmission parameter plus one. In response to the preambletransmission counter variable being less than the preamble maximumtransmission parameter plus one, the wireless device may consider therandom-access procedure incomplete. In an example, the wireless devicemay perform a second LBT procedure for the cell on the one or moreactive uplink BWPs of the cell in response to the random-accessprocedure being incomplete.

In an example, in response to the performing the second LBT procedure,the wireless device may select the third uplink BWP to perform therandom-access procedure. In an example, the cell may be an SpCell (e.g.,PCell, PSCell). In an example, the second downlink BWP specific indexmay be different from the third uplink BWP specific index. In anexample, in response to the second downlink BWP specific index beingdifferent from the third uplink BWP specific index, the wireless devicemay switch from the second downlink BWP to the third downlink BWP (e.g.,the Third DL-BWP in FIG. 26A) of the plurality of downlink BWPs of thecell (e.g., SpCell). In an example, the third downlink BWP specificindex and the third uplink BWP specific index may be the same. Inresponse to the switching from the second downlink BWP to the thirddownlink BWP, the wireless device may perform the random-accessprocedure on the third downlink BWP of the cell and the third uplink BWP(e.g., via the one or more second PRACH resources) of the cell.

In an example, the performing the random-access procedure may comprisetransmitting, in a third slot, at least one second preamble via at leastone second PRACH resource of the third uplink BWP for the random-accessprocedure (at time T5 in FIG. 26B).

In an example, in response to transmitting the at least one secondpreamble in the third slot, the wireless device may start, from a fourthslot, a second configured response window (e.g., ra-responseWindow).

In an example, when the second configured response window is running,the wireless device may monitor for a second random-access response(RAR). The monitoring for the second random-access response may comprisemonitoring, for a second DCI (e.g. a downlink assignment, an uplinkgrant), at least one second PDCCH in the third downlink BWP of the cell(e.g., SpCell).

In an example, when the random-access procedure is not initiated for abeam failure recovery (e.g., contention-free random-access procedure forthe beam failure recovery), in response to receiving the second DCI(e.g., scrambled by RA-RNTI) in the at least one second PDCCH of thethird downlink BWP of the cell, within the second configured responsewindow, and a random-access preamble identifier (in the second RAR)being associated with (or corresponding to) the at least one secondpreamble, a reception of the random-access response may be successfullycompleted (time T6 in FIG. 26B).

In an example, the wireless device may perform a third LBT procedure ofthe cell on the one or more multiple active uplink BWPs of the cell inresponse to the reception of the random-access response beingsuccessfully completed.

In an example, in response to the performing the third LBT procedure,the wireless device may select the second uplink BWP to perform acontention-resolution transmission.

In an example, the cell may be an SpCell (e.g., PCell, PSCell). In anexample, the third downlink BWP specific index may be different from thesecond uplink BWP specific index. In an example, in response to thethird downlink BWP specific index being different from the second uplinkBWP specific index, the wireless device may switch from the thirddownlink BWP to the second downlink BWP (e.g., the Second DL-BWP in FIG.26A). In an example, the second downlink BWP specific index and thesecond uplink BWP specific index may be the same. In response to theswitching from the third downlink BWP to the second downlink BWP, thewireless device may perform the contention-resolution transmission onthe second downlink BWP of the cell and the second uplink BWP of thecell.

In an example, the wireless device may perform a contention-resolutiontransmission. The performing the contention-resolution transmission maycomprise transmitting a third message (e.g., Msg3) via the second uplinkBWP in response to the switching from the third downlink BWP to thesecond downlink BWP. In an example, the wireless device may start acontention resolution timer (e.g., ra-ContentionResolutionTimer) inresponse to the transmitting the third message.

In an example, when the contention resolution timer is running, thewireless device may monitor, for a second DCI (e.g. Msg4, a downlinkassignment, an uplink grant), at least one second PDCCH in the seconddownlink BWP of the cell (e.g., SpCell).

In an example, in response to receiving the second DCI in the at leastone second PDCCH in the second downlink BWP of the cell while thecontention resolution timer is running, the random-access procedure maybe successfully completed.

In an unlicensed band, an LBT procedure may comprise a first back-offoperation. In an example, a random-access procedure may comprise asecond back-off operation (e.g., back-off indicator in the MAC subPDU ofthe RAR). In an example, employing one or more back-off operations(e.g., the first back-off operation and the second back-off operation)may prolong the random-access procedure. In an example, the wirelessdevice may not achieve an uplink synchronization timely in response toprolonging the random-access procedure. In an example, the wirelessdevice may not recover a beam failure timely in response to prolongingthe random-access procedure. In an example, the wireless device maydeclare RLF in response to prolonging the random-access procedure.

In an example, it may be useful for the wireless device to access achannel in response to the channel being idle. The wireless device maydetermine the channel being idle in response to performing an LBT on thechannel and the LBT being successful.

In an example, when a configured response window is running, thewireless device may monitor for a random-access response (RAR). Themonitoring for the random-access response may comprise monitoring, for aDCI (e.g. a downlink assignment, an uplink grant), at least one PDCCH ina second downlink BWP of the cell (e.g., SpCell).

In an example, the wireless device may be operating in an unlicensedband. In an example, the wireless device may receive the random-accessresponse. In an example, the random-access response may comprise a firstMAC subPDU with a back-off indicator. In an example, in response tooperating in the unlicensed band, a value indicated by the back-offindicator may be zero.

In an example, in response to the value indicated by the back-offindicator being zero, the wireless device may start performing a secondLBT procedure for a random-access preamble transmission when thewireless device receives the RAR.

In an example, in response to the value indicated by the back-offindicator being zero, the wireless device may not start a back-offtimer.

In an example, the wireless device may start performing the second LBTprocedure in response to the configured response window expiring.

In an example, the random-access response may not comprise a first MACsubPDU with a back-off indicator in response to operating in theunlicensed band. In an example, in response to the random-accessresponse not comprising the first MAC subPDU with the back-offindicator, the wireless device may set a preamble back-off variable(e.g., PREAMBLE_BACKOFF) to a value (e.g., 0 ms). The value may befixed/predefined. In an example, the wireless device may startperforming a second LBT procedure for a random-access preambletransmission in response to the receiving the RAR.

FIG. 27 shows an example of a random-access procedure as per an aspectof an embodiment of the present disclosure.

The signaling/procedures at time T0, T1 and T2 in FIG. 27 are same asthe ones in FIG. 24B at time T0, T1 and T2

In an example, while the back-off timer is running, the wireless devicemay perform a second random-access resource selection. The wirelessdevice may select a second RS in the one or more RSs. In an example, thesecond RS may be a second SSB. In an example, the second RS may beassociated with (or corresponding to) a second PRACH resource of the oneor more PRACH resources configured on the second uplink BWP. The secondPRACH resource may comprise at least one second preamble and at leastone second PRACH occasion (e.g., time, frequency, code) on the seconduplink BWP. In an example, the second PRACH resource may be acontention-based random-access resource. In an example, the second RSmay be different from the first RS. In response to the second RS beingdifferent from the first RS, the wireless device may stop the back-offtimer and perform a second random-access preamble transmission. In anexample, in the second random-access preamble transmission, the wirelessdevice may transmit, in a third slot (at time T3 in FIG. 27), the atleast one second preamble via the at least one second PRACH resource ofthe second uplink BWP for the random-access procedure. This isillustrated in Case 1 in FIG. 27.

In an example, while the back-off timer is running, the wireless devicemay perform a second random-access resource selection. The wirelessdevice may not find/select a second RS in the one or more RS s differentthan the first RS until the back-off timer expires. In response to thenot finding/selecting the second RS in the one or more RSs, the wirelessdevice may perform a third random-access resource selection in responseto the back-off timer expiring. The third random-access resourceselection may be different from the second random-access resourceselection. This is illustrated in Case 2 in FIG. 27. The wireless devicemay perform a random-access preamble transmission at time T4 in FIG. 27.

The procedures for the back-off timer discussed for Case 1 and Case 2 inFIG. 27 may be applicable for a contention-resolution transmissiondiscussed in FIG. 24B.

In an example, while the back-off timer is running, the wireless devicemay perform an LBT procedure. In response to the performing the LBTprocedure, the wireless device may select a second RS in one or moresecond RSs. In an example, the configuration parameters may comprise theone or more second RSs on a third uplink BWP of the plurality of uplinkBWPs of the cell. In an example, the third uplink BWP may be differentfrom the second uplink BWP. In an example, the second RS may be a secondSSB. In an example, the second RS may be a second CSI-RS. In response tothe second uplink BWP being different from the third uplink BWP, thewireless device may stop the back-off timer and perform a secondrandom-access preamble transmission.

In an example, in the second random-access preamble transmission, thewireless device may transmit, in a third slot (at time T3 in FIG. 27),at least one third preamble via at least one third PRACH resource of thethird uplink BWP for the random-access procedure. In an example, thesecond RS may be associated with (or corresponding to) a second PRACHresource of one or more second PRACH resources configured on the thirduplink BWP. The second PRACH resource may comprise the at least onethird preamble and the at least one third PRACH resource (e.g., time,frequency, code) on the third uplink BWP. The procedures for theback-off timer discussed may be applicable for a contention-resolutiontransmission discussed in FIG. 24B.

In an example, in FIG. 24B, when the configured response window isrunning, the wireless device may monitor for a random-access response(RAR). The monitoring for the random-access response may comprisemonitoring, for a DCI (e.g. a downlink assignment, an uplink grant), atleast one PDCCH in the second downlink BWP of the cell (e.g., SpCell).

In an example, the random-access response may comprise one or moreuplink grants. In an example, at least one of the uplink grants of theone or more uplink grants may indicate one or more time and/or one ormore frequency resources on an uplink BWP of the plurality of the uplinkBWPs of the cell. In an example, the uplink BWP (e.g., the first uplinkBWP, the third uplink BWP) may be different from the second uplink BWP.In an example, the uplink BWP may be deactivated.

In an example, the wireless device may support multiple active uplinkBWPs. In an example, when the wireless device supports the multipleactive uplink BWPs and the uplink BWP is deactivated, in response to theat least one of the uplink grants of the one or more uplink grantsindicating the one or more time and/or the one or more frequencyresources on the uplink BWP, the wireless device may activate the uplinkBWP.

In an example, the wireless device may perform a contention resolutiontransmission on the uplink BWP in response to the activating the uplinkBWP.

In an example, the wireless device may operate in an unlicensed band. Inan example, the wireless device may perform an LBT procedure on theuplink BWP in response to the activating the uplink BWP.

In an example, the wireless device may not support multiple activeuplink BWPs. In an example, when the wireless device does not supportthe multiple active uplink BWPs and the uplink BWP is deactivated, inresponse to the at least one of the uplink grants of the one or moreuplink grants indicating the one or more time and/or the one or morefrequency resources on the uplink BWP, the wireless device may notactivate the uplink BWP.

In an example, the wireless device may not support multiple activeuplink BWPs. In an example, when the wireless device does not supportthe multiple active uplink BWPs and the uplink BWP is deactivated, inresponse to the at least one of the uplink grants of the one or moreuplink grants indicating the one or more time and/or the one or morefrequency resources on the uplink BWP, the wireless device may activatethe uplink BWP and deactivate the active uplink BWP (e.g., the seconduplink BWP).

In an example, the wireless device may not support multiple activeuplink BWPs. In an example, when the wireless device does not supportthe multiple active uplink BWPs and the uplink BWP is deactivated, inresponse to the at least one of the uplink grants of the one or moreuplink grants indicating the one or more time and/or the one or morefrequency resources on the uplink BWP, the wireless device may activatethe uplink BWP if one or more second PRACH resources of the uplink BWPis earlier in time than one or more PRACH resources of the second uplinkBWP.

In an example, the wireless device may not support multiple activeuplink BWPs. In an example, when the wireless device does not supportthe multiple active uplink BWPs and the uplink BWP is deactivated, inresponse to the at least one of the uplink grants of the one or moreuplink grants indicating the one or more time and/or the one or morefrequency resources on the uplink BWP, it may be a UE implementation toactive the uplink BWP.

In an example, if the wireless device decides to activate the uplinkBWP, the wireless device may deactivate the active uplink BWP (e.g., thesecond uplink BWP).

In an example, a wireless device may receive, from a base station, oneor more configuration parameters of a cell (e.g., PCell). The one ormore configuration parameters may comprise downlink BWPs and uplinkBWPs.

In an example, the one or more configuration parameters may furthercomprise downlink BWP specific indices for the downlink BWPs and/oruplink BWP specific indices for the uplink BWPs. In an example, eachdownlink BWP of the downlink BWPs may be identified by a respective onedownlink BWP specific index of the downlink BWP specific indices (e.g.,provided by a higher layer parameter bwp-ID). In an example, each uplinkBWP of the uplink BWPs may be identified by a respective one uplink BWPspecific index of the uplink BWP specific indices (e.g., provided by ahigher layer parameter bwp-ID).

In an example, each of the downlink BWPs may be associated with arespective one of the uplink BWPs. In an example, an uplink BWP of theuplink BWPs may be identified by an uplink BWP specific index. In anexample, a downlink BWP of the downlink BWPs may be identified by adownlink BWP specific index. In an example, the uplink BWP specificindex and the downlink BWP specific index may be the same. In anexample, the uplink BWP and the downlink BWP may be associated inresponse to the uplink BWP specific index and the downlink BWP specificindex being the same.

In an example, the wireless device may be active on one or more multipleactive uplink BWPs. In an example, a first uplink BWP of the uplink BWPsmay be a first active uplink BWP and a second uplink BWP of the uplinkBWPs may be a second active uplink BWP. In an example, the one or moremultiple active uplink BWPs may comprise the first uplink BWP and thesecond uplink BWP.

In an example, the wireless device may initiate a random-accessprocedure.

In an example, the wireless device may perform an LBT procedure on theone or more active uplink BWPs (e.g., the first uplink BWP and thesecond uplink BWP) in response to the initiating the random-accessprocedure.

In an example, the wireless device may select the first uplink BWP inresponse to performing the LBT procedure. In an example, a first LBTprocedure on the first uplink BWP may be successful. In an example, thewireless device may determine that the first uplink BWP is idle.

In an example, the wireless device may transmit a preamble, for therandom-access procedure, via a PRACH resource of the first uplink BWP inresponse to the selecting the first uplink BWP.

In an example, in response to the transmitting, the wireless device maymonitor for a random-access response via a first downlink BWP of thedownlink BWPs within a configured response window (e.g., ra-responsewindow). In an example, the first downlink BWP and the first uplink BWPmay be associated. In an example, the first downlink BWP and the firstuplink BWP being associated may comprise a first downlink BWP specificindex of the first downlink BWP and a first uplink BWP specific index ofthe first uplink BWP being the same.

In an example, the one or more configuration parameters may comprise theconfigured response window.

In an example, the wireless device may not receive the random-accessresponse within the configured response window. In an example, inresponse to not receiving the random-access response, the wirelessdevice may perform a second LBT procedure on the one or more activeuplink BWPs (e.g., the first uplink BWP and the second uplink BWP).

In an example, in response to the performing the second LBT procedure,the wireless device may select the second uplink BWP for transmission ofa second preamble.

In an example, the wireless device may switch from the first downlinkBWP to a second downlink BWP of the downlink BWPs in response toselecting the second uplink BWP for transmission of the second preamble.In an example, the second downlink BWP may be associated with the seconduplink BWP. In an example, the second downlink BWP and the second uplinkBWP being associated may comprise a second downlink BWP specific indexof the second downlink BWP and a second uplink BWP specific index of thesecond uplink BWP being the same.

In an example, in response to the switching from the first downlink BWPto the second downlink BWP, the wireless device may transmit the secondpreamble, for the random-access procedure, on the second uplink BWP.

FIG. 28 is a flow diagram as per an aspect of an example embodiment ofthe present disclosure. At 2810, a wireless device may receive one ormore configuration parameters for uplink bandwidth parts (BWPs) of acell. At 2820, a first preamble may be transmitted, for a random-accessprocedure, via a first uplink BWP of the uplink BWPs. At 2830, arandom-access response comprising a backoff indicator may be received.At 2840, a backoff window associated with the backoff indicator may bestarted. At 2850, a determination may be made that a second uplink BWPof the uplink BWPs that is different from the first uplink BWP isselected, during the backoff window, for transmission of a secondpreamble. At 2860, the second preamble may be transmitted, via thesecond uplink BWP and based on the selecting, for the random-accessprocedure.

FIG. 29 is a flow diagram as per an aspect of an example embodiment ofthe present disclosure. At 2910, a wireless device may transmit a firstpreamble for a random-access procedure via a first uplink bandwidth part(BWP). At 2920, the wireless device may monitor, for a random-accessresponse to the first preamble, a first downlink BWP associated with thefirst uplink BWP. At 2930, a determination may be made that therandom-access response is not received. At 2940, a second uplink BWP maybe selected for transmission of a second preamble based on thedetermination. At 2950, the wireless device may switch from the firstdownlink BWP to a second downlink BWP associated with the second uplinkBWP based on the selecting the second uplink BWP. At 2960, the secondpreamble may be transmitted for the random-access procedure via thesecond uplink BWP.

According to an example embodiment, a wireless device may transmit afirst preamble, for a random-access procedure, via a first uplink BWP. Arandom-access response comprising a backoff indicator may be received. Abackoff window associated with the backoff indicator may be started. Asecond uplink BWP that is different from the first uplink BWP may beselected, during the backoff window, for transmission of a secondpreamble. Based on the selecting, the second preamble may be transmittedvia the second uplink BWP for the random-access procedure.

According to an example embodiment, a wireless device may receive one ormore configuration parameters for uplink bandwidth parts (BWPs) of acell. A first preamble may be transmitted, for a random-accessprocedure, via a first uplink BWP of the uplink BWPs. A random-accessresponse comprising a backoff indicator may be received. A backoffwindow associated with the backoff indicator may be started. A seconduplink BWP of the uplink BWPs that is different from the first uplinkBWP may be selected, during the backoff window, for transmission of asecond preamble. The second preamble may be transmitted, via the seconduplink BWP and based on the selecting, for the random-access procedure.

According to an example embodiment, at least two uplink BWPs of theuplink BWPs may be activated. According to an example embodiment, the atleast two uplink BWPs may comprise the first uplink BWP and the seconduplink BWP. According to an example embodiment, the first uplink BWP maybe activated in a first slot. According to an example embodiment, thesecond uplink BWP may be activated in a second slot.

According to an example embodiment, a first listen-before-talk (LBT)procedure may be performed for the random-access procedure. The firstLBT procedure may comprise a first LBT on the first uplink BWP and asecond LBT on the second uplink BWP.

According to an example embodiment, the transmitting the first preamblevia the first uplink BWP may be based on selecting the first uplink BWP.According to an example embodiment, the first uplink BWP may be selectedbased on the first LBT being successful, the second LBT beingsuccessful; and at least one of: channel load metrics, LBT successrates, channel occupancies, and load histories of the first and seconduplink BWPs. According to an example embodiment, the first uplink BWPmay be selected based on the first LBT being successful and the secondLBT failing. According to an example embodiment, the first LBT on thefirst uplink BWP being successful may comprise a channel on the firstuplink BWP being idle. According to an example embodiment, the secondLBT on the second uplink BWP failing may comprise a channel on thesecond uplink BWP being busy.

According to an example embodiment, the receiving the random-accessresponse comprising the backoff indicator may comprise receiving therandom-access response comprising a medium access control protocol dataunit (MAC PDU) comprising the backoff indicator.

According to an example embodiment, the starting the backoff windowassociated with the backoff indicator may comprise starting a backofftimer associated with the backoff indicator. According to an exampleembodiment, the backoff timer may be stopped based on the selecting thesecond uplink BWP. According to an example embodiment, a second LBTprocedure may be performed for transmission of the second preamble whilethe backoff timer is running. According to an example embodiment,performing the second LBT procedure may comprise a third LBT on thefirst uplink BWP and a fourth LBT on the second uplink BWP. According toan example embodiment, the second LBT procedure may be performed duringthe backoff window. According to an example embodiment, the selectingthe second uplink BWP may be based on the second LBT procedure.According to an example embodiment, the selecting the second uplink BWPmay be based on the third LBT failing; and the fourth LBT beingsuccessful. According to an example embodiment, the selecting the seconduplink BWP may be based on the third LBT being successful; the fourthLBT being successful; and at least one of: channel load metrics, LBTsuccess rates, channel occupancies, and load histories of the first andsecond uplink BWPs.

According to an example embodiment, the random-access procedure may be acontention-based random-access procedure. According to an exampleembodiment, the random-access procedure may be a contention-freerandom-access procedure.

According to an example embodiment, the transmitting the second preamblemay comprise transmitting the second preamble during the backoff window

According to an example embodiment, a wireless device may transmit afirst preamble for a random-access procedure via a first uplinkbandwidth part (BWP). A first downlink BWP associated with the firstuplink BWP may be monitored for a random-access response to the firstpreamble. A determination may be made that the random-access response isnot received. Based on the determination, a second uplink BWP may beselected for transmission of a second preamble. Based on the selectingthe second uplink BWP, the wireless device may switch from the firstdownlink BWP to a second downlink BWP associated with the second uplinkBWP. The second preamble may be transmitted for the random-accessprocedure via the second uplink BWP.

According to an example embodiment, the wireless device may receive oneor more configuration parameters. The one or more configurationparameters may indicate downlink BWPs comprising the first downlink BWPand the second downlink BWP. The one or more configuration parametersmay indicate uplink BWPs comprising the first uplink BWP and the seconduplink BWP. According to an example embodiment, each of the downlinkBWPs is associated with a respective one of the uplink BWPs.

Embodiments may be configured to operate as needed. The disclosedmechanism may be performed when certain criteria are met, for example,in a wireless device, a base station, a radio environment, a network, acombination of the above, and/or the like. Example criteria may bebased, at least in part, on for example, wireless device or network nodeconfigurations, traffic load, initial system set up, packet sizes,traffic characteristics, a combination of the above, and/or the like.When the one or more criteria are met, various example embodiments maybe applied. Therefore, it may be possible to implement exampleembodiments that selectively implement disclosed protocols.

A base station may communicate with a mix of wireless devices. Wirelessdevices and/or base stations may support multiple technologies, and/ormultiple releases of the same technology. Wireless devices may have somespecific capability(ies) depending on wireless device category and/orcapability(ies). A base station may comprise multiple sectors. When thisdisclosure refers to a base station communicating with a plurality ofwireless devices, this disclosure may refer to a subset of the totalwireless devices in a coverage area. This disclosure may refer to, forexample, a plurality of wireless devices of a given LTE or 5G releasewith a given capability and in a given sector of the base station. Theplurality of wireless devices in this disclosure may refer to a selectedplurality of wireless devices, and/or a subset of total wireless devicesin a coverage area which perform according to disclosed methods, and/orthe like. There may be a plurality of base stations or a plurality ofwireless devices in a coverage area that may not comply with thedisclosed methods, for example, because those wireless devices or basestations perform based on older releases of LTE or 5G technology.

In this disclosure, “a” and “an” and similar phrases are to beinterpreted as “at least one” and “one or more.” Similarly, any termthat ends with the suffix “(s)” is to be interpreted as “at least one”and “one or more.” In this disclosure, the term “may” is to beinterpreted as “may, for example.” In other words, the term “may” isindicative that the phrase following the term “may” is an example of oneof a multitude of suitable possibilities that may, or may not, beemployed to one or more of the various embodiments.

If A and B are sets and every element of A is also an element of B, A iscalled a subset of B. In this specification, only non-empty sets andsubsets are considered. For example, possible subsets of B={cell1,cell2} are: {cell1}, {cell2}, and {cell1, cell2}. The phrase “based on”(or equally “based at least on”) is indicative that the phrase followingthe term “based on” is an example of one of a multitude of suitablepossibilities that may, or may not, be employed to one or more of thevarious embodiments. The phrase “in response to” (or equally “inresponse at least to”) is indicative that the phrase following thephrase “in response to” is an example of one of a multitude of suitablepossibilities that may, or may not, be employed to one or more of thevarious embodiments. The phrase “depending on” (or equally “depending atleast to”) is indicative that the phrase following the phrase “dependingon” is an example of one of a multitude of suitable possibilities thatmay, or may not, be employed to one or more of the various embodiments.The phrase “employing/using” (or equally “employing/using at least”) isindicative that the phrase following the phrase “employing/using” is anexample of one of a multitude of suitable possibilities that may, or maynot, be employed to one or more of the various embodiments.

The term configured may relate to the capacity of a device whether thedevice is in an operational or non-operational state. Configured mayalso refer to specific settings in a device that effect the operationalcharacteristics of the device whether the device is in an operational ornon-operational state. In other words, the hardware, software, firmware,registers, memory values, and/or the like may be “configured” within adevice, whether the device is in an operational or nonoperational state,to provide the device with specific characteristics. Terms such as “acontrol message to cause in a device” may mean that a control messagehas parameters that may be used to configure specific characteristics ormay be used to implement certain actions in the device, whether thedevice is in an operational or non-operational state.

In this disclosure, various embodiments are disclosed. Limitations,features, and/or elements from the disclosed example embodiments may becombined to create further embodiments within the scope of thedisclosure.

In this disclosure, parameters (or equally called, fields, orInformation elements: IEs) may comprise one or more information objects,and an information object may comprise one or more other objects. Forexample, if parameter (IE) N comprises parameter (IE) M, and parameter(IE) M comprises parameter (IE) K, and parameter (IE) K comprisesparameter (information element) J. Then, for example, N comprises K, andN comprises J. In an example embodiment, when one or more messagescomprise a plurality of parameters, it implies that a parameter in theplurality of parameters is in at least one of the one or more messages,but does not have to be in each of the one or more messages.

Furthermore, many features presented above are described as beingoptional through the use of “may” or the use of parentheses. For thesake of brevity and legibility, the present disclosure does notexplicitly recite each and every permutation that may be obtained bychoosing from the set of optional features. However, the presentdisclosure is to be interpreted as explicitly disclosing all suchpermutations. For example, a system described as having three optionalfeatures may be embodied in seven different ways, namely with just oneof the three possible features, with any two of the three possiblefeatures or with all three of the three possible features.

Many of the elements described in the disclosed embodiments may beimplemented as modules. A module is defined here as an element thatperforms a defined function and has a defined interface to otherelements. The modules described in this disclosure may be implemented inhardware, software in combination with hardware, firmware, wetware (i.e.hardware with a biological element) or a combination thereof, all ofwhich may be behaviorally equivalent. For example, modules may beimplemented as a software routine written in a computer languageconfigured to be executed by a hardware machine (such as C, C++,Fortran, Java, Basic, Matlab or the like) or a modeling/simulationprogram such as Simulink, Stateflow, GNU Octave, or LabVIEWMathScript.Additionally, it may be possible to implement modules using physicalhardware that incorporates discrete or programmable analog, digitaland/or quantum hardware. Examples of programmable hardware comprise:computers, microcontrollers, microprocessors, application-specificintegrated circuits (ASICs); field programmable gate arrays (FPGAs); andcomplex programmable logic devices (CPLDs). Computers, microcontrollersand microprocessors are programmed using languages such as assembly, C,C++ or the like. FPGAs, ASICs and CPLDs are often programmed usinghardware description languages (HDL) such as VHSIC hardware descriptionlanguage (VHDL) or Verilog that configure connections between internalhardware modules with lesser functionality on a programmable device. Theabove mentioned technologies are often used in combination to achievethe result of a functional module.

The disclosure of this patent document incorporates material which issubject to copyright protection. The copyright owner has no objection tothe facsimile reproduction by anyone of the patent document or thepatent disclosure, as it appears in the Patent and Trademark Officepatent file or records, for the limited purposes required by law, butotherwise reserves all copyright rights whatsoever.

While various embodiments have been described above, it should beunderstood that they have been presented by way of example, and notlimitation. It will be apparent to persons skilled in the relevantart(s) that various changes in form and detail can be made thereinwithout departing from the scope. In fact, after reading the abovedescription, it will be apparent to one skilled in the relevant art(s)how to implement alternative embodiments. Thus, the present embodimentsshould not be limited by any of the above described exemplaryembodiments.

In addition, it should be understood that any figures which highlightthe functionality and advantages, are presented for example purposesonly. The disclosed architecture is sufficiently flexible andconfigurable, such that it may be utilized in ways other than thatshown. For example, the actions listed in any flowchart may bere-ordered or only optionally used in some embodiments.

Further, the purpose of the Abstract of the Disclosure is to enable theU.S. Patent and Trademark Office and the public generally, andespecially the scientists, engineers and practitioners in the art whoare not familiar with patent or legal terms or phraseology, to determinequickly from a cursory inspection the nature and essence of thetechnical disclosure of the application. The Abstract of the Disclosureis not intended to be limiting as to the scope in any way.

Finally, it is the applicant's intent that only claims that include theexpress language “means for” or “step for” be interpreted under 35U.S.C. 112. Claims that do not expressly include the phrase “means for”or “step for” are not to be interpreted under 35 U.S.C. 112.

What is claimed is:
 1. A method comprising: receiving, by a wirelessdevice, one or more configuration parameters for uplink bandwidth parts(BWPs) of a cell; transmitting a first preamble, for a random-accessprocedure, via a first uplink BWP of the uplink BWPs; receiving arandom-access response comprising a backoff indicator; starting abackoff window associated with the backoff indicator; selecting, fortransmission of a second preamble and during the backoff window, asecond uplink BWP of the uplink BWPs that is different from the firstuplink BWP; and transmitting, via the second uplink BWP and based on theselecting, the second preamble for the random-access procedure.
 2. Themethod of claim 1, further comprising activating at least two uplinkBWPs of the uplink BWPs, the at least two uplink BWPs comprising thefirst uplink BWP and the second uplink BWP.
 3. The method of claim 2,further comprising: activating the first uplink BWP in a first slot; andactivating the second uplink BWP in a second slot.
 4. The method ofclaim 1, further comprising performing, for the random-access procedure,a first listen-before-talk (LBT) procedure comprising a first LBT on thefirst uplink BWP and a second LBT on the second uplink BWP.
 5. Themethod of claim 4, wherein the transmitting the first preamble via thefirst uplink BWP is based on selecting the first uplink BWP based on:the first LBT being successful; the second LBT being successful; and atleast one of: channel load metrics, LBT success rates, channeloccupancies, and load histories of the first and second uplink BWPs. 6.The method of claim 4, wherein the transmitting the first preamble viathe first uplink BWP is based on selecting the first uplink BWP basedon: the first LBT being successful; and the second LBT failing.
 7. Themethod of claim 6, wherein the first LBT on the first uplink BWP beingsuccessful comprises a channel on the first uplink BWP being idle. 8.The method of claim 6, wherein the second LBT on the second uplink BWPfailing comprises a channel on the second uplink BWP being busy.
 9. Themethod of claim 1, wherein the receiving the random-access responsecomprising the backoff indicator further comprises receiving therandom-access response comprising a medium access control protocol dataunit (MAC PDU) comprising the backoff indicator.
 10. The method of claim1, wherein the starting the backoff window associated with the backoffindicator comprises starting a backoff timer associated with the backoffindicator.
 11. The method of claim 10, further comprising stopping thebackoff timer based on the selecting the second uplink BWP.
 12. Themethod of claim 11, further comprising performing, for transmission ofthe second preamble, a second LBT procedure while the backoff timer isrunning.
 13. The method of claim 12, wherein the performing the secondLBT procedure comprising a third LBT on the first uplink BWP and afourth LBT on the second uplink BWP.
 14. The method of claim 13, furthercomprising performing the second LBT procedure during the backoffwindow.
 15. The method of claim 14, wherein the selecting the seconduplink BWP is based on the second LBT procedure.
 16. The method of claim15, wherein the selecting the second uplink BWP is based on: the thirdLBT failing; and the fourth LBT being successful.
 17. The method ofclaim 15, wherein the selecting the second uplink BWP is based on: thethird LBT being successful; the fourth LBT being successful; and atleast one of: channel load metrics, LBT success rates, channeloccupancies, and load histories of the first and second uplink BWPs. 18.The method of claim 1, wherein the random-access procedure is acontention-based random-access procedure.
 19. The method of claim 1,wherein the random-access procedure is a contention-free random-accessprocedure.
 20. The method of claim 1, wherein the transmitting thesecond preamble comprises transmitting the second preamble during thebackoff window.